dial-up freezing, Windows Me

The following problem remains after all(?) usual tricks (re-install Windows, create new dial-ups, re-install all apps used for internet, etc.): the dial-up icon clicking works fine after booting i.e. it opens the internet session (ADSL+USB modem). But after some time of use of the computer OR some time on without use, cliking generates a “frozen session” i.e. the icon appears crossed in the taskbar, task manager does not allow to stop it, and re-booting is the next option. Happens irregularly, but very often. On the same machine does not occur with Windows 2000 pro. Tks.