Check your Power Management. The laptop /may/ be in a hibernation
state. If this is only happening when you are *not* using the laptop
then I would guess the laptop after a set amount of time the laptop
enters into hibernation.
To Check Power Options:
Go into the Control Panel > Power Options. Is hibernation set at X
amount of minutes? If this option is then set then set the option to
never and see if the laptop shuts off after you walk away.
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