What to do if your iPhone 4S keeps going off by itself?

My iphone keeps going off by itself and turning back on by itself. Like if I get on one of my apps, my screen turns black and goes off by itself and turns back on. I tried resetting my iPhone 2 times but it still does this. Can someone please help me with this because its so annoying.

You could call the Apple Company and they can probably help you and let you know what's going on with it and how to stop it or if you just need to get a new phone or not.

Mine's does the exact same. I had to buy a wee cheap phone as a back-up. I regret buying the iphone as it was so expensive for this to happen.

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