My browser cruises along fine most of the day, then usually sometime after about 5 or 6 hours of use, I try to get to a website, and the progress bar shows it tries to connect, then it just stalls.  I can still get to the internet with other programs like a weather radar app, but neither IE7 or FireFox can access any websites.  What would cause the browser to lose the ability to connect while I can still get other apps to access?  The Vista Network Status Center shows a connection.  I tried resetting the cable modem and router, no help.  Only if I reboot do things come back up like normal.

Thanks,

Mike