Ok Ive been having this problem for a while now. If I leave my computer on for more than 3-4 hours without any activity then Internet stops working. The modem shows all lights OK but it doesnt work till I restart. Sometimes if I right click the lan icon and click 'repair' then the net comes back to life again, but most of the times I have to restart.Its really irritating of course and Airtel has no clue whatsoever !Doesn anyone know what to do ?Thanks much!