IPhone 4 shutting down, then turns back on?

My iPhone started doing this yesterday. It shuts off (it has like 80% battery) and then turns back on a few minutes later. It has happened four more times today, and it is getting a little frustrating. Any ideas/help?

How long have you had it for? If you've had it for at least 2 years, it may just be because it's old. Take it to the Apple Store and see if they can do anything about it.

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