Galaxy S3 Displays Shut Down/Restart Menu, Shuts Off

[AC Question]

Whenever I turn on my screen and unlock the device, the "Shut Down/Restart/Airplane Mode" menu pops up, then the device shuts off automatically. Pretty much wants to shut down whenever the screen turns off, and it's been happening for a couple of days now. Tried a factory restore, but the problem persists. Any ideas?

 

[the tall guy]

Is the power button perhaps stuck or jammed?

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