Log full of these errors

Since 2-3 days i am having the log completely full of these errors:

2020-05-31 11:34:08 ERROR (MainThread) [homeassistant.core] Error doing job: Future exception was never retrieved
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/urllib/request.py", line 1319, in do_open
  File "/usr/local/lib/python3.7/http/client.py", line 1252, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/lib/python3.7/http/client.py", line 1298, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.7/http/client.py", line 1247, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.7/http/client.py", line 1026, in _send_output
  File "/usr/local/lib/python3.7/http/client.py", line 966, in send
  File "/usr/local/lib/python3.7/http/client.py", line 938, in connect
    (self.host,self.port), self.timeout, self.source_address)
  File "/usr/local/lib/python3.7/socket.py", line 707, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
  File "/usr/local/lib/python3.7/socket.py", line 752, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name does not resolve

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/homeassistant/homeassistant/components/feedreader/__init__.py", line 82, in <lambda>
    track_time_interval(hass, lambda now: self._update(), self._scan_interval)
  File "/usr/src/homeassistant/homeassistant/components/feedreader/__init__.py", line 95, in _update
    modified=None if not self._feed else self._feed.get("modified"),
  File "/usr/local/lib/python3.7/site-packages/feedparser/api.py", line 230, in parse
    data = _open_resource(url_file_stream_or_string, etag, modified, agent, referrer, handlers, request_headers, result)
  File "/usr/local/lib/python3.7/site-packages/feedparser/api.py", line 138, in _open_resource
    return http.get(url_file_stream_or_string, etag, modified, agent, referrer, handlers, request_headers, result)
  File "/usr/local/lib/python3.7/site-packages/feedparser/http.py", line 175, in get
    f = opener.open(request)
  File "/usr/local/lib/python3.7/urllib/request.py", line 525, in open
    response = self._open(req, data)
  File "/usr/local/lib/python3.7/urllib/request.py", line 543, in _open
    '_open', req)
  File "/usr/local/lib/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/usr/local/lib/python3.7/urllib/request.py", line 1347, in http_open
    return self.do_open(http.client.HTTPConnection, req)
  File "/usr/local/lib/python3.7/urllib/request.py", line 1321, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [Errno -2] Name does not resolve>

How to fix and is there someone else having the same issues?

Looks like you have either an invalid hostname somewhere, or a DNS issue

Hmmm… i did not changed anything…where to check it?