Mopidy unavailable: 136-line error message in log file

Hi again, it seems my Mopidy problems are escalating unfortunately. It was stable for several hours but then it turned dark blue on the web interface and said: “Unavailable”. Upon restart of Mopidy, it turns light blue again but only for about 30 seconds. Then the 136-line error message appears in the log file. I post the last couple of lines in the file below. Any ideas? Any help will be greatly appreciated.

  File "/usr/lib/python3.6/site-packages/homeassistant/core.py", line 1002, in _event_to_service_call
    await service_handler.func(service_call)
  File "/usr/lib/python3.6/site-packages/homeassistant/components/media_player/__init__.py", line 403, in async_service_handler
    yield from getattr(player, method['method'])(**params)
  File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/lib/python3.6/site-packages/homeassistant/components/media_player/mpd.py", line 295, in play_media
    self._client.clear()
  File "/usr/lib/python3.6/site-packages/mpd.py", line 629, in decorator
    return wrapper(self, name, args, bound_decorator(self, returnValue))
  File "/usr/lib/python3.6/site-packages/mpd.py", line 254, in _execute
    return retval()
  File "/usr/lib/python3.6/site-packages/mpd.py", line 623, in decorator
    return function(self, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/mpd.py", line 379, in _fetch_nothing
    line = self._read_line()
  File "/usr/lib/python3.6/site-packages/mpd.py", line 287, in _read_line
    raise ConnectionError("Connection lost while reading line")
mpd.ConnectionError: Connection lost while reading line