Random Connection Problems when playing Garry's Mod

Ok. I use a wireless adapter (Belkin G Wireless), and something strange is happening. When I start up Garry’s Mod to play multiplayer with friends, I can only stay in-game for a matter of seconds to minutes. My wireless adapter seems to shut off, but I think only when playing Garry’s Mod (online). I can play Counter-Strike or DoD perfectly fine. Oh, and i’m also wondering why I receive no lag from CS:S or DoD at high graphics but I receive loads and loads of lag from Garry’s Mod even on Minimum graphics.

Gmod is a memory whore and its servers are often crap

Yea thats what I was thinking.