My iphone 4 restarts it self?

So my iphone 4 which is updated to IOS 6, keeps restarting on its own
Do you guys know why it happens?

Do a complete restore, make sure everything is backed up to your computer or a iCloud account. If that doesn't work, take it to the Apple store. They will run a full diagnosis on it and tell you what's wrong.

Are you jailbroken? If so, it is completely normal and nothing to be woried about. I just say, when it is restarting, don't push any buttons, let it do what needs to do. Wait for it to turn back on. I've had to restore my phone plenty of times because of that.

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