Since my dad changed our router I've been experiencing connection problems in Source games (Tested: Gmod, Tf2) or Steam. The problem is that when I play on a game server and after a little while everything and everyone stops moving and the little box in the top that says something about connection lost auto disconnect in 30-s. Then I get disconnected for "Lost connection to server". I've tried this on two different Garry's Mod servers and one Team Fortress 2 server. I've checked my AVG (Not sure how to shut off completely, I have only disabled the "anti-virus" part. I tested playing BFBC2 and it went totally fine.
I've also tried to take away UPnP, that did not solve the problem.
Thanks in advance.