My iPhone 4s keeps rebooting?

I'll be randomly using it and it reboots itself.
it goes to dark grey screen then shuts off.
and then starts back up with the apple logo.
and i can use it for about 3 minutes until that happens again.
I've closed all the apps that were working in the background and it still happens.
its not jail broken either.

please give me some idea of something that may fix this or even just what the problem is.

If a factory restore in itunes does not fix the problem, then it is a hardware issue and you will need to get it fixed.

Try the itunes restore first

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