Handle improper 1000 closures by Discord

discord/gateway.py

@@ -606,7 +606,10 @@ class DiscordWebSocket:
 
     def _can_handle_close(self) -> bool:
         code = self._close_code or self.socket.close_code
-        return code not in (1000, 4004, 4010, 4011, 4012, 4013, 4014)
+        # If the socket is closed remotely with 1000 and it's not our own explicit close
+        # then it's an improper close that should be handled and reconnected
+        is_improper_close = self._close_code is None and self.socket.close_code == 1000
+        return is_improper_close or code not in (1000, 4004, 4010, 4011, 4012, 4013, 4014)
 
     async def poll_event(self) -> None:
         """Polls for a DISPATCH event and handles the general gateway loop.