Wireless Adapter Disconnects????

My wireless adapter disconnects from my network after about 3-10 minutes of gameplay. but only ONLINE.

It only does this with Garry’s Mod though, so I don’t know what the deal is. Has anyone else had this problem in the past? is it using too much bandwidth? I am just begging for help because It really ticks me off.

EDIT: The wireless adapter is a Belkin G Wireless.