I have an alienware 17 and it keep randomly going to sleep. twice it has happened today to give you an idea of how often. I have checked all the sleep settings and turned them all off. I have no magnetic bracelet that makes the computer thing the lid is closed, i even took it to a computer place and they couldn't figure it out. HELP its not over heating because i have had the fans replaced and the computer place did a stress test on the system.