(usr-tc) Normal User Call Clear

I have a user that suddenly about a week ago couldn't stay on longer than 9 minutes and some-odd seconds. They are using a Dell computer with a USR PCI winmodem. The disconnect reason is reported as Normal User Call Clear. We had them bring in the computer yesterday and were able to connect longer from our office, but when they brought it home the same thing happened. Does anyone have any ideas? Thanks. Mike Wilker Director of Network Operations Local Link, Inc.