My computer these past couple days has been shutting down for no reason. Ill have nothing open or barely anything open. My computer usually does it every 15-20 min. It starts up automatically and is very fast (5-8 seconds). It tries to reboot once and it actually failed to reboot twice in a row. I dont think its a hardware issue but i could be wrong. Nothing seems to be overheating which is a good sign but i still haven't been able to figure it out.