Moments ago my Tab S shut down after trying to exit a game. Suddenly the game froze, screen went dark for a minute while the capacitive buttons stayed lit and gave feedback. Then it was dead. Kept pressing the power button but it would not turn on. After doing some searching I tried pressing the power button while pressing volume up and fortunately it turned on again. I did notice the back was a bit warm but not HOT. Anyone have a clue as to what may have happened?