Mine just suddenly goes to sleep, while typing or running anything. Sometimes the battery light just blinks, even if plugged in. Then self reboot 1- 20 times. Sometimes if I shake it wakes up, but no guarantee it will stay awake. Other times the battery light doesn't blink, but all is the same. This happens every day. A friend says- Trojan horse, switch system to Linnex. After the Service Pack 2 loaded Dell replaced the mother board and hard drive, Norton is on it and spy-bot. But I am ready to throw it out.