Well, it could be a router/modem problem. It sounds like your router is losing its communication with your computer. This can happen if the router can't handle the traffic & your computer is too busy. This is also common with USB modems which utilise both power & cpu from the computer. See (scroll down to) 3.4 USB-based modems/routers http://forums.whirlpool.net.au/forum...es.cfm?t=86201

Can you tell us what brand & model no. of your modem/router? Other details about your comp will also help.