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They all turn on at midnight for system maintenance/checking of alarms & notifications. It is only supposed to stay on for a couple minutes then shutdown.
I've found that if there is ANYTHING touching the screen when this happens it may not turn off. The touch is interpreted as a tap and it sits there waiting...and waiting...until the battery drains. Had it happen one night, and caught it waiting on a couple other occasions. Now I don't leave it in my backpack overnight anymore because of that.
Chris...
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