Having problems with Garry's Mod, please help me!?

Gamer Girl

New member
during multiplayer games, on Steam, i can play for a while and then all of a sudden my screen will like start freaking out (random colours, lines, general blackness, etc.) and i can go to windows and then back into the game and it fixes itself, but only for like 5 min. If i have to play like this im going to shoot myself, any ideas on how to fix it??
 
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