some time ago I had a problem with Zone Alarm on my daughters computer when we went on line.
It would allow you to connect but would not surf.
although this was immediate, could you have a firewall or virus checker that is blocking or disconnecting your service?
I also got caught with Outlook Express hanging up after checking the mail, somehow the box was ticked to 'Hang Up'after checking mail.
could it be your virus protector or anything thats doing an update when you go online and booting you when its done??
You have had 2 modems and you tried one at least on another computer and it worked ok but have you tried someone elses that works on your computer?
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