Problem with wireless router: disconnects every few minutes

Hi, thanks for looking at my thread. I'm having problems with my wireless router at home. It's a Netgear WNR2000 and I'm running Windows 7 (64-bit) on a ThinkPad W510.

Without fail, about once every 5-20 minutes, the signal will drop down then completely disconnect. I then have to open up the wireless connections window and manually reconnect to the signal. I also use wireless internet at my university very often, but I NEVER have to manually reconnect to their signal. When I'm at school, if the signal happens to drop out for a second, my computer automatically finds it again and reconnects.

Since these problems never happen on campus, I'm convinced that it's my router and not my computer. However, I suppose it could have something to do with the way it switches to new signals, but I've searched through all the settings and can't figure out how to fix this if it really is my computer's fault. My home router (the Netgear router in question) is set as my preferred router in my wireless settings, so I'm even more confused by this. If it's my computer's fault, why is it searching for another signal when it already has the preferred signal!?

Any help would be appreciated immensely!