One guess is that it's your firewall "helpfully" telling you that it's earning its keep.
See if you can find out how to turn off the warnings. They're of no use to you, there's nothing you can, or should, do about them, all they do is interrupt you and worry you to no useful purpose.
Better, put a stealth mode NAT router between you and the internet so that this crap never gets anywhere near your PC in the first place.