Repeated ConnectionReset errors

I’ve seen lots of similar posts before, but most of them seemed to suggest problem was with a Camera platform. I don’t have any cameras but I get these all the time (sporadic, but lately about every 10 mins).

ConnectionResetError: Cannot write to closing transport
2018-10-16 10:04:30 ERROR (MainThread) [aiohttp.server] Unhandled exception
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/aiohttp/web_protocol.py", line 410, in start
    await resp.prepare(request)
  File "/usr/local/lib/python3.6/site-packages/aiohttp/web_response.py", line 300, in prepare
    return await self._start(request)
  File "/usr/local/lib/python3.6/site-packages/aiohttp/web_response.py", line 608, in _start
    return await super()._start(request)
  File "/usr/local/lib/python3.6/site-packages/aiohttp/web_response.py", line 367, in _start
    await writer.write_headers(status_line, headers)
  File "/usr/local/lib/python3.6/site-packages/aiohttp/http_writer.py", line 110, in write_headers
    self._write(buf)
  File "/usr/local/lib/python3.6/site-packages/aiohttp/http_writer.py", line 67, in _write
    raise ConnectionResetError('Cannot write to closing transport')
ConnectionResetError: Cannot write to closing transport

Any suggestions?

I’ve been so annoyed with these and other random and repetitive log entries that I have solved it with:

logger:
  default: critical

in my configuration.yaml