In the settings, you can set it to never turn off or go to sleep. It should be called something like "Sleep and Power settings" I think. That will prevent it from getting stuck since you'll have to manually power it off, which you say works fine.
While you're in teh device settings, you might also check what version you're running -- that will help people tell you if they've had similar problems with that upgrade version. that's located under "device information" i believe.
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