Fix WebSocket reconnection logic

strategies/grid_trader.py

@@ -361,13 +361,7 @@ def check_ws_connection(self):
             # 嘗試關閉現有連接
             if self.ws:
                 try:
-                    if hasattr(self.ws, 'running') and self.ws.running:
-                        self.ws.running = False
-                    if hasattr(self.ws, 'ws') and self.ws.ws:
-                        try:
-                            self.ws.ws.close()
-                        except:
-                            pass
+                    # 使用 BackpackWebSocket 的 close 方法以確保完全斷開
                     self.ws.close()
                     time.sleep(0.5)
                 except Exception as e:

ws_client/client.py

@@ -250,10 +250,12 @@ def reconnect(self):
                 on_pong=self.on_pong
             )
 
-            # 創建新線程
+            # 創建新線程並重新啟動心跳
+            self.running = True
             self.ws_thread = threading.Thread(target=self.ws_run_forever)
             self.ws_thread.daemon = True
             self.ws_thread.start()
+            self.start_heartbeat()
 
             # 更新最後心跳時間，避免重連後立即觸發心跳檢測
             self.last_heartbeat = time.time()