OK,
just out of curiosity I started (solo) mining.
It worked for about an hour,
then I got an error:

20:38:14.201906 INFO Miner thread was started

20:38:14.201906 INFO Mining has started with 1 threads, good luck!
21:39:33.361025 WARNING [213.113.202.163:30000 OUT] Exception in connectionHandler:
TcpConnection::read, WSAGetOverlappedResult failed, result=10060, A connection attempt failed
because the connected party did not properly respond after a period of time, or established connection failed
because connected host has failed to respond.

How to proceed ?