What could cause a laptop to shut down during sleep at rando

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I'm running windows 8. Lately, it seems that at random, I open the "sleeping" computer only to see it has shut down. Lack of battery power is not the issue and I have turned all automatic updates off (because forced restarts/updates were annoying as f**k in windows . To see if the computer has shut itself down normally during sleep- I went to the event log and saw that there was an "Event 41- The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly." So the computer just turned off during sleep. Could there have been a short lapse in power to the RAM or something in the middle of sleep within the computer (though battery is full)? Or could there be something wrong with my computer?

This only happens at random and I have checked my power settings.

If you have a temperature monitor, run some CPU/GPU intensive applications simultaneously, and maybe a flash video on top of that, and see what happens. If your computer shuts, off you may have heat issues caused by dirt/dust buildup, or perhaps faulty thermal sensors. When you put your system in hibernate mode, the fans will spin up for maybe 30 seconds or so to cool the CPU and GPU off before fully entering hibernate mode.

Could be a few things, but at the top of my list would be overheating. I once knew someone that put there computer to sleep and put it in a back pack, causing it to overheat.

Second would be a bad connection with the battery, if put to sleep and moved around it is possible the laptop has lost power for a split second causing it to shut off.

I've also seen viruses that will stop your computer from truly sleeping, then when idle they do there bidding, which may include restarting or forcing a shutdown.