AT&T router internet help

I need help with my internet; it fucking randomly drops out. What can I do to make that not happen? My router is in a room about 30-50 from my computer. I have AT&T, 2701HG-B router. Some days it'll run perfectly fine, but on days like today it'll just completely fuck up. Lag with facebook chat messages, logging off and logging on to games repeatedly, etc. There are 3 devices (including my own) using it at the moment. Settings I can use to at least make it better? Or just tips in general?

There's really no such thing as a good wireless router. Just draw some wires, or have extra modems installed in the house. You won't have to worry about someone attempting to steal access to your connection, and it won't cut out every fucking half day on you.