I just got it to work and now I think I'm getting disconnects every 15-ish minutes. I don't think they're full on disconnects, but I use a voice program called Ventrilo and I would just be surfing on the net and I would hear "disconnected from server". That rarely happened with my old router, but now I'm getting it every few minutes.
The reason I say I don't think it's a full disconnect is because I have AIM open and it doesn't say anything about losing connection or reconnecting (at least there haven't been any popups saying so), I'm pretty sure I could still access the web with my browser, and I don't have any popups from Windows saying that I can't detect a network or w.e.
I've tried enabling and disabling QOS. I have no idea what DNS is so I don't use it. I haven't touched any of the port forwarding stuff and filters. I don't think I messed with the firewall except to enable anti-spoof checking. I have AT&T DSL with a Dynamic setup with the comp plugged directly to the router.