Sorry or not updating. Did a internet game recently and managed to play 3 hours without error.

So for sure if it is still happening to my settings, it will be very intermittent.

I think I have added the log section with the problem noted.

4989.289 Error ServerMultiplayerManager.cpp:95: MultiplayerManager failed: multiplayer.invalid-address("pingpong1.factorio.com:34197", "No such host is known. ")
4989.289 Info ServerMultiplayerManager.cpp:696: mapTick(163803) changing ...

I was just trying out the PvP Production Score game mode for myself, in anticipation of a game with friends soon.
No one else was connected and I managed to play for some time.
However, at one point the message "pingpong1.factorio.com:34197 is not a valid address" popped op.
After pressing OK, it ...