services: fix TTS websocket services disconnections

Fixes #1467

src/pipecat/services/lmnt/tts.py

@@ -122,7 +122,7 @@ class LmntTTSService(InterruptibleTTSService):
     async def _connect_websocket(self):
         """Connect to LMNT websocket."""
         try:
-            if self._websocket:
+            if self._websocket and self._websocket.open:
                 return
 
             logger.debug("Connecting to LMNT")
@@ -158,11 +158,11 @@ class LmntTTSService(InterruptibleTTSService):
                 # errors on the websocket, so we just skip it for now.
                 # await self._websocket.send(json.dumps({"eof": True}))
                 await self._websocket.close()
-                self._websocket = None
-
-            self._started = False
         except Exception as e:
             logger.error(f"{self} error closing websocket: {e}")
+        finally:
+            self._started = False
+            self._websocket = None
 
     def _get_websocket(self):
         if self._websocket:
@@ -170,7 +170,7 @@ class LmntTTSService(InterruptibleTTSService):
         raise Exception("Websocket not connected")
 
     async def flush_audio(self):
-        if not self._websocket:
+        if not self._websocket or self._websocket.closed:
             return
         await self._get_websocket().send(json.dumps({"flush": True}))
 
@@ -203,7 +203,7 @@ class LmntTTSService(InterruptibleTTSService):
         logger.debug(f"{self}: Generating TTS [{text}]")
 
         try:
-            if not self._websocket:
+            if not self._websocket or self._websocket.closed:
                 await self._connect()
 
             try: