I really doubt it. Fresh installation as of this weekend for Windows, and barely had it connected. Norton running, router firewall, etc. Certainly can't be 100% since none of that stuff is bulletproof, but I just doubt that's the issue.

I've found just a tiny bit more. For sure it's http that stops after 5 minutes or so. However, POP3 (email), NNTP (news), and even https (secure web pages) all coninue to work just fine. Something is blocking http after a while.

I don't have Zone-Alarm or any software firewalls installed that I know of. Possibly it's Norton Anti-virus doing something? Or the built-in Windows "ICF" internet connection firewall?

Time for sleep, will continue tomorrow.