Wireless Network and Xbox 360 (Help!)

I am currently using a Belkin N Wireless USB Adapter for my pc running Microsoft Windows Professional. I can connect to a local wireless network and it seems to work decently. I recently have tried to connect my Xbox 360 to my pc via Ethernet cable, and turn on ICS with the wireless network to share with the Xbox. I can connect to Xbox live for about 5-10 minutes and then I will just loose the connection. I will unplug the ethernet cord from my Xbox and wait about 20 seconds and then the wireless connection will come back and work fine. This is really frustrating when trying to play on Xbox Live and can only play in 5-10 minute periods.

Please someone help me out here.