Iphone 5 rebooted for no reason

I was on my iphone earlier today and the screen went black and then it flashed to the little apple start up screen and just shut down and then quickly booted back up again. I'm scared that my iphone is slowly dying on me. What shoud i do?

It's normal don't worry. My iphone 5S does this and it's annoying but not often.

It's a typical Apple glitch.

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