Computer Forces Modem To Lose DSL Signal Repeatedly

So i have AT&T dsl internet. but whenever i connect my computer wirelessly to the modem and get on the internet it repeatedly loses dsl connection every some odd minutes. the dsl light on my modem turns off, then blinks red, then fixes itself for five or so minutes until the cycle restarts. ive tried 2 wireless usb adapter and 1 internal wireless card. none have worked at all. but if its wired with an ethernet cord it works fine. we also have 2 other laptops that connect wirelessly and work fine. i dont understand what would cause this solely on my computer. ive also had AT&T come to my house and look at it and they said its fine, the issue is somewhere in my computer messing with the modem.