diff --git a/ESP32_CAN_Logger-a.ino b/ESP32_CAN_Logger-a.ino
index 2605b0e..7de162b 100644
--- a/ESP32_CAN_Logger-a.ino
+++ b/ESP32_CAN_Logger-a.ino
@@ -287,7 +287,64 @@ int commentCount = 0;
 // Forward declarations
 void IRAM_ATTR canISR();
 void webSocketEvent(uint8_t num, WStype_t type, uint8_t *payload, size_t length);
+void resetMCP2515();
 
+
+
+void resetMCP2515() {
+    Serial.println("🔄 MCP2515 리셋 시작...");
+    
+    // 1. 로깅 중지 (진행 중이면)
+    if (loggingEnabled) {
+        // 버퍼 플러시 및 파일 닫기
+    }
+    
+    // 2. CAN 큐 비우기
+    CANMessage tempMsg;
+    while (xQueueReceive(canQueue, &tempMsg, 0) == pdTRUE) {
+        // 큐에서 모든 메시지 제거
+    }
+    
+    // 3. MCP2515 하드 리셋
+    digitalWrite(HSPI_CS, LOW);
+    delay(10);
+    digitalWrite(HSPI_CS, HIGH);
+    delay(50);
+    
+    // 4. MCP2515 재초기화
+    mcp2515.reset();
+    delay(100);
+    mcp2515.setBitrate(currentCanSpeed, MCP_8MHZ);
+    delay(10);
+    
+    // 5. 모드 설정 (Normal/Loopback/Listen Only)
+    if (currentMcpMode == MCP_MODE_NORMAL) {
+        mcp2515.setNormalMode();
+    } else if (currentMcpMode == MCP_MODE_LOOPBACK) {
+        mcp2515.setLoopbackMode();
+    } else {
+        mcp2515.setListenOnlyMode();
+    }
+    
+    // 6. 버퍼 클리어
+    struct can_frame dummyFrame;
+    while (mcp2515.readMessage(&dummyFrame) == MCP2515::ERROR_OK) {
+        // MCP2515 수신 버퍼 비우기
+    }
+    mcp2515.clearRXnOVRFlags();
+    
+    // 7. 통계 리셋
+    totalMsgCount = 0;
+    lastMsgCount = 0;
+    msgPerSecond = 0;
+    
+    // 8. 최근 메시지 테이블 클리어
+    for (int i = 0; i < RECENT_MSG_COUNT; i++) {
+        recentData[i].count = 0;
+    }
+    
+    Serial.println("✅ MCP2515 리셋 완료!");
+}
 // ========================================
 // PSRAM 초기화 함수
 // ========================================
@@ -914,12 +971,15 @@ void sdWriteTask(void *parameter) {
             
             // CAN 로깅
             if (loggingEnabled && sdCardReady) {
-                if (xSemaphoreTake(sdMutex, pdMS_TO_TICKS(50)) == pdTRUE) {
+                // ⭐⭐⭐ 뮤텍스 타임아웃 1ms로 감소 (블로킹 방지)
+                if (xSemaphoreTake(sdMutex, pdMS_TO_TICKS(1)) == pdTRUE) {
                     if (canLogFormatCSV) {
                         char csvLine[128];
                         uint64_t relativeTime = canMsg.timestamp_us - canLogStartTime;
                         char dataStr[32];
                         int dataLen = 0;
+                        static uint32_t csvReopenCounter = 0;
+
                         for (int i = 0; i < canMsg.dlc; i++) {
                             dataLen += sprintf(&dataStr[dataLen], "%02X", canMsg.data[i]);
                             if (i < canMsg.dlc - 1) dataStr[dataLen++] = ' ';
@@ -931,23 +991,40 @@ void sdWriteTask(void *parameter) {
                             relativeTime, canMsg.id, canMsg.dlc, dataStr);
                         
                         if (logFile) {
-                            logFile.write((uint8_t*)csvLine, lineLen);
+                            size_t written = logFile.write((uint8_t*)csvLine, lineLen);
                             currentFileSize += lineLen;
                             
                             static int csvFlushCounter = 0;
-                            if (++csvFlushCounter >= 20) {  // 50 → 20으로 더 자주 플러시
+                            if (++csvFlushCounter >= 50) {  // ⭐ 20 → 50 (너무 자주 플러시하면 느림)
                                 logFile.flush();
                                 csvFlushCounter = 0;
                             }
+
+                            // ⭐⭐⭐ 500개마다 파일 재오픈 (핵심!)
+                            if (++csvReopenCounter >= 500) {
+                                logFile.close();
+                                logFile = SD.open(currentFilename, FILE_APPEND);
+                                if (logFile) {
+                                    Serial.printf("✓ CSV 파일 재오픈: %s (%lu bytes)\n", currentFilename, currentFileSize);
+                                } else {
+                                    Serial.println("✗ CSV 파일 재오픈 실패!");
+                                    loggingEnabled = false;
+                                }
+                                csvReopenCounter = 0;
+                            }
+
                         }
                     } else {
                         // BIN 형식
+                        static uint32_t binMsgCounter = 0;
+                        static uint32_t binReopenCounter = 0;
+                        
                         // ⭐⭐⭐ 1단계: 버퍼 가득 찼으면 먼저 플러시
                         if (bufferIndex + sizeof(CANMessage) > FILE_BUFFER_SIZE) {
                             if (logFile) {
                                 size_t written = logFile.write(fileBuffer, bufferIndex);
                                 logFile.flush();
-                                Serial.printf("✓ BIN 버퍼 플러시: %d bytes written\n", written);
+                                Serial.printf("✓ BIN 버퍼 플러시 (FULL): %d bytes\n", written);
                                 bufferIndex = 0;
                             }
                         }
@@ -956,6 +1033,39 @@ void sdWriteTask(void *parameter) {
                         memcpy(&fileBuffer[bufferIndex], &canMsg, sizeof(CANMessage));
                         bufferIndex += sizeof(CANMessage);
                         currentFileSize += sizeof(CANMessage);
+                        binMsgCounter++;
+                        binReopenCounter++;
+                        
+                        // ⭐⭐⭐ 3단계: 100개 메시지마다 주기적 플러시
+                        if (binMsgCounter % 100 == 0) {
+                            if (logFile && bufferIndex > 0) {
+                                size_t written = logFile.write(fileBuffer, bufferIndex);
+                                logFile.flush();
+                                Serial.printf("✓ BIN 주기 플러시: %d bytes (메시지: %d)\n", written, binMsgCounter);
+                                bufferIndex = 0;
+                            }
+                        }
+                        
+                        // ⭐⭐⭐ 4단계: 500개마다 파일 재오픈 (핵심!)
+                        if (binReopenCounter >= 500) {
+                            // 버퍼 먼저 플러시
+                            if (logFile && bufferIndex > 0) {
+                                logFile.write(fileBuffer, bufferIndex);
+                                logFile.flush();
+                                bufferIndex = 0;
+                            }
+                            
+                            // 파일 닫고 다시 열기
+                            logFile.close();
+                            logFile = SD.open(currentFilename, FILE_APPEND);
+                            if (logFile) {
+                                Serial.printf("✓ BIN 파일 재오픈: %s (%lu bytes)\n", currentFilename, currentFileSize);
+                            } else {
+                                Serial.println("✗ BIN 파일 재오픈 실패!");
+                                loggingEnabled = false;
+                            }
+                            binReopenCounter = 0;
+                        }
                     }
                     xSemaphoreGive(sdMutex);
                 }
@@ -1308,9 +1418,14 @@ void webSocketEvent(uint8_t num, WStype_t type, uint8_t *payload, size_t length)
                             loggingEnabled = true;
                             bufferIndex = 0;
                             currentFileSize = logFile.size();
-                            Serial.printf("✓ 로깅 파일 열림 (APPEND): %s\n", currentFilename);
+                            Serial.printf("✅ 로깅 시작!\n");
+                            Serial.printf("   파일: %s\n", currentFilename);
+                            Serial.printf("   형식: %s\n", canLogFormatCSV ? "CSV" : "BIN");
+                            Serial.printf("   초기 크기: %lu bytes\n", currentFileSize);
+                            Serial.printf("   sdCardReady: %d\n", sdCardReady);
                         } else {
                             Serial.println("✗ APPEND 모드로 파일 열기 실패");
+                            Serial.printf("  파일명: %s\n", currentFilename);
                         }
                     } else {
                         Serial.println("✗ 파일 생성 실패");
@@ -1322,18 +1437,35 @@ void webSocketEvent(uint8_t num, WStype_t type, uint8_t *payload, size_t length)
         }
         else if (strcmp(cmd, "stopLogging") == 0) {
             if (loggingEnabled) {
-                if (xSemaphoreTake(sdMutex, pdMS_TO_TICKS(1000)) == pdTRUE) {
+                Serial.println("🛑 로깅 중지 요청...");
+                
+                if (xSemaphoreTake(sdMutex, pdMS_TO_TICKS(2000)) == pdTRUE) {
+                    // ⭐⭐⭐ BIN 형식: 버퍼에 남은 데이터 강제 플러시
                     if (bufferIndex > 0 && logFile) {
-                        logFile.write(fileBuffer, bufferIndex);
+                        size_t written = logFile.write(fileBuffer, bufferIndex);
+                        logFile.flush();
+                        Serial.printf("✓ 최종 플러시: %d bytes\n", written);
                         bufferIndex = 0;
                     }
                     
+                    // ⭐⭐⭐ CSV 형식: 최종 플러시
+                    if (canLogFormatCSV && logFile) {
+                        logFile.flush();
+                        Serial.println("✓ CSV 최종 플러시");
+                    }
+                    
                     if (logFile) {
+                        size_t finalSize = logFile.size();
                         logFile.close();
+                        Serial.printf("✓ 파일 닫힘: %s (%lu bytes)\n", currentFilename, finalSize);
                     }
                     
                     loggingEnabled = false;
+                    currentFilename[0] = '\0';
+                    bufferIndex = 0;
                     xSemaphoreGive(sdMutex);
+                } else {
+                    Serial.println("✗ sdMutex 획득 실패!");
                 }
             }
         }
@@ -1761,6 +1893,97 @@ void webSocketEvent(uint8_t num, WStype_t type, uint8_t *payload, size_t length)
                 mcp2515.setListenOnlyMode();
             }
         }
+        else if (strcmp(cmd, "addSequence") == 0) {
+            // ⭐⭐⭐ Sequence 저장 기능
+            if (sequenceCount >= MAX_SEQUENCES) {
+                Serial.println("✗ Sequence 저장 실패: 최대 개수 초과");
+                DynamicJsonDocument response(256);
+                response["type"] = "error";
+                response["message"] = "Maximum sequences reached";
+                String json;
+                serializeJson(response, json);
+                webSocket.sendTXT(num, json);
+            } else {
+                const char* name = doc["name"];
+                int repeatMode = doc["repeatMode"] | 0;
+                int repeatCount = doc["repeatCount"] | 1;
+                JsonArray stepsArray = doc["steps"];
+                
+                if (name && stepsArray.size() > 0) {
+                    CANSequence* seq = &sequences[sequenceCount];
+                    
+                    // 이름 복사
+                    strncpy(seq->name, name, sizeof(seq->name) - 1);
+                    seq->name[sizeof(seq->name) - 1] = '\0';
+                    
+                    // Repeat 설정
+                    seq->repeatMode = repeatMode;
+                    seq->repeatCount = repeatCount;
+                    
+                    // Steps 복사
+                    seq->stepCount = 0;
+                    for (JsonObject stepObj : stepsArray) {
+                        if (seq->stepCount >= 20) break;  // 최대 20개
+                        
+                        SequenceStep* step = &seq->steps[seq->stepCount];
+                        
+                        // ID 파싱 (0x 제거)
+                        const char* idStr = stepObj["id"];
+                        if (idStr) {
+                            if (strncmp(idStr, "0x", 2) == 0 || strncmp(idStr, "0X", 2) == 0) {
+                                step->canId = strtoul(idStr + 2, NULL, 16);
+                            } else {
+                                step->canId = strtoul(idStr, NULL, 16);
+                            }
+                        }
+                        
+                        step->extended = stepObj["ext"] | false;
+                        step->dlc = stepObj["dlc"] | 8;
+                        
+                        // Data 배열 복사
+                        JsonArray dataArray = stepObj["data"];
+                        for (int i = 0; i < 8 && i < dataArray.size(); i++) {
+                            step->data[i] = dataArray[i];
+                        }
+                        
+                        step->delayMs = stepObj["delay"] | 0;
+                        
+                        seq->stepCount++;
+                    }
+                    
+                    sequenceCount++;
+                    
+                    // SD 카드에 저장
+                    if (xSemaphoreTake(sdMutex, pdMS_TO_TICKS(1000)) == pdTRUE) {
+                        File seqFile = SD.open("/sequences.dat", FILE_WRITE);
+                        if (seqFile) {
+                            seqFile.write((uint8_t*)&sequenceCount, sizeof(sequenceCount));
+                            seqFile.write((uint8_t*)sequences, sizeof(CANSequence) * sequenceCount);
+                            seqFile.close();
+                            Serial.printf("✓ Sequence 저장 완료: %s (Steps: %d)\n", name, seq->stepCount);
+                        } else {
+                            Serial.println("✗ sequences.dat 열기 실패");
+                        }
+                        xSemaphoreGive(sdMutex);
+                    }
+                    
+                    // 성공 응답
+                    DynamicJsonDocument response(256);
+                    response["type"] = "sequenceSaved";
+                    response["name"] = name;
+                    response["steps"] = seq->stepCount;
+                    String json;
+                    serializeJson(response, json);
+                    webSocket.sendTXT(num, json);
+                    
+                    // Sequence 목록 다시 전송
+                    delay(100);
+                    webSocket.sendTXT(num, "{\"cmd\":\"getSequences\"}");
+                } else {
+                    Serial.println("✗ Sequence 저장 실패: 잘못된 데이터");
+                }
+            }
+        }
         else if (strcmp(cmd, "getSequences") == 0) {
             DynamicJsonDocument response(3072);
             response["type"] = "sequences";
@@ -1778,6 +2001,149 @@ void webSocketEvent(uint8_t num, WStype_t type, uint8_t *payload, size_t length)
             serializeJson(response, json);
             webSocket.sendTXT(num, json);
         }
+        else if (strcmp(cmd, "startSequence") == 0) {
+            // ⭐⭐⭐ Sequence 실행
+            int index = doc["index"] | -1;
+            
+            if (index >= 0 && index < sequenceCount) {
+                seqRuntime.running = true;
+                seqRuntime.activeSequenceIndex = index;
+                seqRuntime.currentStep = 0;
+                seqRuntime.currentRepeat = 0;
+                seqRuntime.lastStepTime = millis();
+                
+                Serial.printf("✓ Sequence 시작: %s (index: %d)\n", sequences[index].name, index);
+                
+                // 성공 응답
+                DynamicJsonDocument response(256);
+                response["type"] = "sequenceStarted";
+                response["index"] = index;
+                response["name"] = sequences[index].name;
+                String json;
+                serializeJson(response, json);
+                webSocket.sendTXT(num, json);
+            } else {
+                Serial.printf("✗ Sequence 시작 실패: 잘못된 index %d\n", index);
+            }
+        }
+        else if (strcmp(cmd, "stopSequence") == 0) {
+            // ⭐⭐⭐ Sequence 중지
+            if (seqRuntime.running) {
+                Serial.println("✓ Sequence 중지됨");
+                seqRuntime.running = false;
+                seqRuntime.activeSequenceIndex = -1;
+                
+                // 성공 응답
+                DynamicJsonDocument response(256);
+                response["type"] = "sequenceStopped";
+                String json;
+                serializeJson(response, json);
+                webSocket.sendTXT(num, json);
+            }
+        }
+        else if (strcmp(cmd, "removeSequence") == 0) {
+            // ⭐⭐⭐ Sequence 삭제
+            int index = doc["index"] | -1;
+            
+            if (index >= 0 && index < sequenceCount) {
+                Serial.printf("✓ Sequence 삭제: %s (index: %d)\n", sequences[index].name, index);
+                
+                // 배열에서 제거 (뒤의 항목들을 앞으로 이동)
+                for (int i = index; i < sequenceCount - 1; i++) {
+                    memcpy(&sequences[i], &sequences[i + 1], sizeof(CANSequence));
+                }
+                
+                sequenceCount--;
+                
+                // SD 카드에 저장
+                if (xSemaphoreTake(sdMutex, pdMS_TO_TICKS(1000)) == pdTRUE) {
+                    File seqFile = SD.open("/sequences.dat", FILE_WRITE);
+                    if (seqFile) {
+                        seqFile.write((uint8_t*)&sequenceCount, sizeof(sequenceCount));
+                        seqFile.write((uint8_t*)sequences, sizeof(CANSequence) * sequenceCount);
+                        seqFile.close();
+                        Serial.printf("✓ SD 카드 업데이트: %d개 sequence\n", sequenceCount);
+                    }
+                    xSemaphoreGive(sdMutex);
+                }
+                
+                // 성공 응답
+                DynamicJsonDocument response(256);
+                response["type"] = "sequenceDeleted";
+                response["index"] = index;
+                String json;
+                serializeJson(response, json);
+                webSocket.sendTXT(num, json);
+                
+                // Sequence 목록 업데이트
+                delay(100);
+                webSocket.sendTXT(num, "{\"cmd\":\"getSequences\"}");
+            } else {
+                Serial.printf("✗ Sequence 삭제 실패: 잘못된 index %d\n", index);
+            }
+        }
+        else if (strcmp(cmd, "getSequenceDetail") == 0) {
+            // ⭐⭐⭐ Sequence 상세 정보 (Edit용)
+            int index = doc["index"] | -1;
+            
+            if (index >= 0 && index < sequenceCount) {
+                DynamicJsonDocument response(4096);
+                response["type"] = "sequenceDetail";
+                response["index"] = index;
+                response["name"] = sequences[index].name;
+                response["repeatMode"] = sequences[index].repeatMode;
+                response["repeatCount"] = sequences[index].repeatCount;
+                
+                JsonArray stepsArray = response.createNestedArray("steps");
+                for (int i = 0; i < sequences[index].stepCount; i++) {
+                    SequenceStep* step = &sequences[index].steps[i];
+                    JsonObject stepObj = stepsArray.createNestedObject();
+                    
+                    char idStr[12];
+                    sprintf(idStr, "0x%X", step->canId);
+                    stepObj["id"] = idStr;
+                    stepObj["ext"] = step->extended;
+                    stepObj["dlc"] = step->dlc;
+                    
+                    JsonArray dataArray = stepObj.createNestedArray("data");
+                    for (int j = 0; j < 8; j++) {
+                        dataArray.add(step->data[j]);
+                    }
+                    
+                    stepObj["delay"] = step->delayMs;
+                }
+                
+                String json;
+                serializeJson(response, json);
+                webSocket.sendTXT(num, json);
+                
+                Serial.printf("✓ Sequence 상세 전송: %s (index: %d)\n", sequences[index].name, index);
+            } else {
+                Serial.printf("✗ Sequence 상세 조회 실패: 잘못된 index %d\n", index);
+            }
+        }else if (strcmp(cmd, "hwReset") == 0) {
+            // ⭐⭐⭐ ESP32 하드웨어 리셋 (재부팅)
+            Serial.println("📨 하드웨어 리셋 요청 수신");
+            Serial.println("🔄 ESP32 재부팅 중...");
+            Serial.println("");
+            Serial.println("========================================");
+            Serial.println("           ESP32 REBOOTING...");
+            Serial.println("========================================");
+            
+            // 응답 전송
+            DynamicJsonDocument response(256);
+            response["type"] = "hwReset";
+            response["success"] = true;
+            String json;
+            serializeJson(response, json);
+            webSocket.sendTXT(num, json);
+            
+            // 약간의 지연 후 재부팅 (응답 전송 시간 확보)
+            delay(100);
+            
+            // ESP32 재부팅
+            ESP.restart();
+        }
     }
 }
 
@@ -2212,13 +2578,13 @@ void setup() {
     
     // Task 생성
     xTaskCreatePinnedToCore(canRxTask, "CAN_RX", 8192, NULL, configMAX_PRIORITIES - 1, &canRxTaskHandle, 1);  // Core 0, Pri 24
-    xTaskCreatePinnedToCore(sdWriteTask, "SD_WRITE", 12576, NULL, 6, &sdWriteTaskHandle, 0);
+    xTaskCreatePinnedToCore(sdWriteTask, "SD_WRITE", 18576, NULL, 6, &sdWriteTaskHandle, 0);
     xTaskCreatePinnedToCore(sequenceTask, "SEQ", 4096, NULL, 2, NULL, 1);
     xTaskCreatePinnedToCore(serialRxTask, "SERIAL_RX", 6144, NULL, 5, &serialRxTaskHandle, 0);
     xTaskCreatePinnedToCore(serial2RxTask, "SERIAL2_RX", 6144, NULL, 5, &serial2RxTaskHandle, 0);  // ⭐ Serial2
     xTaskCreatePinnedToCore(txTask, "TX", 4096, NULL, 3, NULL, 1);
-    xTaskCreatePinnedToCore(webUpdateTask, "WEB_UPDATE", 16384, NULL, 5, &webTaskHandle, 0);  // ⭐ 10240 → 16384
-    xTaskCreatePinnedToCore(sdMonitorTask, "SD_MONITOR", 4096, NULL, 1, NULL, 0);
+    xTaskCreatePinnedToCore(webUpdateTask, "WEB_UPDATE", 10384, NULL, 2, &webTaskHandle, 0);  // ⭐ 10240 → 16384
+    xTaskCreatePinnedToCore(sdMonitorTask, "SD_MONITOR", 4096, NULL, 1, NULL, 1);
     
     if (timeSyncStatus.rtcAvailable) {
         xTaskCreatePinnedToCore(rtcSyncTask, "RTC_SYNC", 3072, NULL, 0, &rtcTaskHandle, 0);
diff --git a/index.h b/index.h
index fb0893b..0ad2163 100644
--- a/index.h
+++ b/index.h
@@ -75,7 +75,7 @@ const char index_html[] PROGMEM = R"rawliteral(
         /* 전력 경고 배너 */
         .power-warning {
             background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
-            color: #666;
+            color: white;  /* ⭐ #666 → white */
             padding: 12px 20px;
             border-radius: 8px;
             margin-bottom: 15px;
@@ -339,7 +339,7 @@ const char index_html[] PROGMEM = R"rawliteral(
             cursor: pointer;
             transition: all 0.3s;
             background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
-            color: #666;
+            color: white;  /* ⭐ #666 → white */
         }
         .control-row button:hover {
             transform: translateY(-2px);
@@ -360,7 +360,7 @@ const char index_html[] PROGMEM = R"rawliteral(
         }
         thead {
             background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
-            color: #666;
+            color: white;  /* ⭐ #666 → white */
         }
         th {
             padding: 12px 8px;
@@ -479,21 +479,21 @@ const char index_html[] PROGMEM = R"rawliteral(
         }
         .download-btn {
             background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
-            color: #666;
+            color: white;  /* ⭐ #666 → white */
         }
         .download-btn:hover {
             background: linear-gradient(135deg, #5568d3 0%, #66409e 100%);
         }
         .comment-btn {
             background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
-            color: #666;
+            color: white;  /* ⭐ #666 → white */
         }
         .comment-btn:hover {
             background: linear-gradient(135deg, #e77fe8 0%, #e44459 100%);
         }
         .delete-btn {
             background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
-            color: #666;
+            color: white;  /* ⭐ #666 → white */
         }
         .delete-btn:hover {
             background: linear-gradient(135deg, #d32f3f 0%, #e53935 100%);
@@ -823,6 +823,7 @@ const char index_html[] PROGMEM = R"rawliteral(
                 <div class="control-row">
                     <button onclick="startLogging()" style="background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);">Start Logging</button>
                     <button onclick="stopLogging()" style="background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);">Stop Logging</button>
+                    <button onclick="hardwareReset()" style="background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); color: white;">🔄 Hardware Reset</button>
                     <button onclick="refreshFiles()">Refresh Files</button>
                     <button onclick="clearMessages()">Clear Display</button>
                 </div>
@@ -943,19 +944,11 @@ const char index_html[] PROGMEM = R"rawliteral(
                 document.getElementById('sync-status').textContent = '연결됨';
                 document.getElementById('sync-status').style.color = '#38ef7d';
                 
-                // ⭐⭐⭐ 자동 시간 동기화 (1분에 1회로 제한)
-                const now = Date.now();
-                const lastSync = parseInt(localStorage.getItem('lastTimeSync') || '0');
-                
-                if (now - lastSync > 60000) {  // 1분 이상 경과
-                    setTimeout(function() {
-                        syncTimeFromPhone();
-                        localStorage.setItem('lastTimeSync', now.toString());
-                        console.log('Auto time sync on connect');
-                    }, 100);
-                } else {
-                    console.log('Skipping time sync (last sync was recent)');
-                }
+                // ⭐⭐⭐ 자동 시간 동기화 (페이지 로드 시 항상 실행)
+                setTimeout(function() {
+                    syncTimeFromPhone();
+                    console.log('✅ Auto time sync on page load');
+                }, 500);  // WebSocket 안정화 대기
                 
                 // ⭐ WebSocket 연결되면 즉시 파일 목록 요청
                 setTimeout(function() {
@@ -1004,6 +997,9 @@ const char index_html[] PROGMEM = R"rawliteral(
                         if (data.success) {
                             console.log('Comment saved successfully');
                         }
+                    } else if (data.type === 'hwReset') {
+                        console.log('✅ 하드웨어 리셋 명령 전송됨 - ESP32 재부팅 중...');
+                        // ESP32가 재부팅되므로 WebSocket 연결 끊김
                     }
                 } catch (e) {
                     console.error('Parse error:', e);
@@ -1393,12 +1389,42 @@ const char index_html[] PROGMEM = R"rawliteral(
             if (ws && ws.readyState === WebSocket.OPEN) {
                 ws.send(JSON.stringify({cmd: 'stopLogging'}));
                 console.log('Stop logging command sent');
+                
+                // ⭐⭐⭐ 로깅 종료 시 Messages 카운트 리셋
+                document.getElementById('msg-count').textContent = '0';
+                document.getElementById('msg-speed').textContent = '0/s';
+                console.log('✅ Messages count reset to 0');
+                
                 setTimeout(() => {
                     refreshFiles();
                 }, 1000);
             }
         }
         
+        function hardwareReset() {
+            if (!confirm('ESP32를 재부팅하시겠습니까?\n\n⚠️ 모든 로깅이 중지되고 WebSocket 연결이 끊어집니다.\n재부팅 후 웹페이지를 새로고침하세요.')) {
+                return;
+            }
+            
+            if (ws && ws.readyState === WebSocket.OPEN) {
+                console.log('🔄 하드웨어 리셋 요청...');
+                ws.send(JSON.stringify({cmd: 'hwReset'}));
+                
+                // 메시지 카운터 리셋
+                document.getElementById('msg-count').textContent = '0';
+                document.getElementById('msg-speed').textContent = '0/s';
+                console.log('✅ 하드웨어 리셋 요청 전송됨');
+                
+                // 3초 후 알림
+                setTimeout(() => {
+                    alert('ESP32가 재부팅 중입니다...\n\n10초 후 웹페이지를 새로고침하세요!');
+                }, 1000);
+            } else {
+                alert('WebSocket이 연결되지 않았습니다!');
+                console.error('WebSocket not connected');
+            }
+        }
+        
         function refreshFiles() {
             console.log('Requesting file list...');  // ⭐ 디버그
             if (ws && ws.readyState === WebSocket.OPEN) {