Doesn't happen every time. Is that consistent with a dead battery?
The mobo can hold some charge in it's capacitors but after that it's on the battery to keep the clock going and the bios chip alive(depends on the mobo a bit but some do that). Did it happen any times when you left the pc off for longer than normal?
Not really sure, but it's a good theory. It may not have been turned on in a couple of days before this morning.
@Clockwise started
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Doesn't happen every time. Is that consistent with a dead battery?