I have no solution, but the same problem occurred to me starting Thursday, Oct 27. In my case, I can stay online 30 minutes before I have to reboot. It is interesting that I have three computers on my cable modem and router and the only one that this problem occurred to was a Windows 98SE machine. The others are running XP and have no problems. I am very interested in what you find, and if any of my other sources help, I will relay it to you.
a few days ago internet explorer started malfunctioning, and i have not changed anything. it works for about 5 minutes then suddenly it no longer works, and my road runner medic says, no internet connection can be found, but my cable modem is working and i can connect always by clicking on my AOL. my internet explorer is via Road Runner high speed cable, but i also have bring your own access AOL. I have windows 98. if i shut down my pc, when i restart, internet explorer works again, but only for 5 minutes, then it is gone. i am baffled. help.