Strange multiplayer bug

[biggun34]

If i have to restart my game and rejoin the server I was on i get 20 fps, where i was getting 120 before. to get rid of this problem I have to restart my whole system. Now it's not the game as when I host a server its fine.
This started happening about 3 days ago and it's doing my nut in, any ideas?

 

[MaHuD]

Does it do this on any server or specific servers?

 

[biggun34]

Well strangely it fixed itself after a week, nothing was changed. It was warband in general, this only happens on dayz now.

 

[MaHuD]

Could be a virus? Or maybe the incidents were all on a really hot day that secretly caused overheating issues?