Ecowitt suddenly stopped working

After my new WeatherStations runs perfectly for about a week, ecowitt integration suddenly stopped working. In ecowitt everything is fine, all data from my weather station I can see online on ecowitt. But the HA integration stopped working. Suddenly all ecowitt entities are shown as restored:

In my logfiles I found two entries for ecowitt:

Logger: homeassistant.config_entries
Source: custom_components/ecowitt/__init__.py:290
First occurred: 7:48:24 PM (1 occurrences)
Last logged: 7:48:24 PM

Error unloading entry Ecowitt on port 4199 for ecowitt
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 353, in async_unload
    result = await component.async_unload_entry(hass, self)  # type: ignore
  File "/config/custom_components/ecowitt/__init__.py", line 290, in async_unload_entry
    await ws.stop()
  File "/usr/local/lib/python3.8/site-packages/pyecowitt/ecowitt.py", line 304, in stop
    await self.site.stop()
  File "/usr/local/lib/python3.8/site-packages/aiohttp/web_runner.py", line 68, in stop
    self._runner._check_site(self)
  File "/usr/local/lib/python3.8/site-packages/aiohttp/web_runner.py", line 319, in _check_site
    raise RuntimeError(f"Site {site} is not registered in runner {self}")
RuntimeError: Site <aiohttp.web_runner.TCPSite object at 0x7f988687b0> is not registered in runner <aiohttp.web_runner.ServerRunner object at 0x7f98cd76d0>

and

Logger: homeassistant.config_entries
Source: helpers/entity_component.py:174
First occurred: 7:48:18 PM (2 occurrences)
Last logged: 7:48:18 PM

Error unloading entry Ecowitt on port 4199 for sensor
Error unloading entry Ecowitt on port 4199 for binary_sensor
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 353, in async_unload
    result = await component.async_unload_entry(hass, self)  # type: ignore
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 77, in async_unload_entry
    return await hass.data[DOMAIN].async_unload_entry(entry)
  File "/usr/src/homeassistant/homeassistant/helpers/entity_component.py", line 174, in async_unload_entry
    raise ValueError("Config entry was never loaded!")
ValueError: Config entry was never loaded!

I’ve already tried a few things. Restored Snapshot form Release 2021.4.5 back to Release 2021.4.4 and than to Release 2021.4.1. But unfortunately none of that was of any use.

Does anyone have any idea what I can do to fix the problem?

I renew the config in app WS View. After this all sensors come alive. Only one device is shown as unavailable at the moment. Don`t know why but try to figure it out.