IPhone 4S Shut itself off and won't turn on

my iphone 4s has turned off and won't turn on.
it doesn't respond to the power button and won't respond to being plugged in.
the last time I used it was about an hour before I noticed it.
the last thing I did was put one photo on to my photostream.
it had been sitting in an air conditioning room, and on a desk during the whole hour or so I wasn't using it.
anyone have any ideas what might be wrong with it?
i am 100% sure I'll have to take it to a store to figure it out unless it suddenly works.. but any ideas would be helpful....

My 4s did the same thing yesterday. I locked the screen, then about ten minutes later I went to use it and nothing would work. Like the phone was completely dead. I tried everything, plugging it in, reboot, nothing at all worked. Then about five minutes later I hit the lock button again and the apple logo appeared and it started rebooting. Not sure what happened!!

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