For the last month or so (maybe month? Maybe a few weeks? I've got a 4-month old, so time means nothing at the moment), my Windows 7 machine has been shutting itself down completely at random. There's no logic or warning. Sometimes it's when I'm in the middle of typing something. Sometimes it's when I've walked away for a few minutes. There is no BSOD, just a shutdown followed by a restart.
(Prior to this, the computer would randomly go to sleep in the middle of me working. It doesn't do that any more. Apparently things have escalated.)
The laptop sits on one of those cooling-fan-desk things, so overheating isn't a problem.
Any idea what I can do to keep this from happening?