give us a bit more to go on..
What type of service do you use? Cable? DSL? This sounds like you could have intermittant service from your ISP and its hanging your modem. They may even be dropping you when inactive to free up bandwidth.
Who makes your USB device? have you rebooted in recent history?
Sorry for all of the questions but my ESP is weak.
i used DSL.so if the problem i had is what u said so what can i do for it.
what do u mean by who make my USB device ? i used this one
http://img485.imageshack.us/img485/9867/100497196tm.gif
when it doesn't work it said like something can't recognized or something.No i habven't rebooted my comp in recent history.and what is it btw :cheesy: sorry i'm kinda dump
but that's ok when i unplug and plug it in again it works.