I have a Naim Audio upnp compatible hifi. I have set up my W7 pc and my W7 laptop to stream music via my netgear DG834g modem. All works fine for between 10mins and 40 mins then the sound cuts out and the track playing restarts at the beginning again. The Naim displays full maximum buffering and displays the message "contact with server lost" when the problem happens. I have a ps3 which streams fine and I have hard wired the modem into the hifi with the same results and have tried switching off the Norton firewall but success. Can anyone offer any suggestions.