My computer has begun to randomly and abruptly shut-down and re-boot, for no obvious reason. I have XP Pro. The only factors I can think of are that I have recently installed a home network to my laptop and have had Cable Broadband installed. The only 'hint' I get is after a file has been downloaded I get an 'Auto Shutdown' message box with 9 seconds to cancel/ confirm. I don't know why this happens, or even if it is connected to the more random shutdowns I get without the warning massage.