I have the exact same router and have the same troubles.
My desktop is linked with a direct line connect to it and that works fine.
My friend, who uses the same router, has a wireless connection via his laptop and that keeps booting him off or results in slow downloads. It keeps saying something about a wireless network being detected, and when I try to reconnect it to the same network, it either immediatly doesn't connect or connects to drop it in 5 minutes.
I've tried resetting my router (by turning it off and unplugging it) along with my cable modem and it still happens.
Yes, if anyone else can help us it would be appreciated.