Why my iphone 4 keep rebooting by its self?

My iphone keep rebooting by it self. When i turn on my iphone it would show the apple logo then it would stay on there then turn off then it would boot back up again and show the apple logo. Sometimes it would go to the lock screen but when i'm on the lock screen and click any button like the home button, volume button, or the sleep button it would freeze then reboot again. Even if i slide to unlock the slider would stay at the end then freeze then reboot again. I already had restored 3 times. Twice in dfu mode then one time regularly. The iphone will still conncect even if the iphone logo just keep poping up. The iphone will still connect to itunes.

This looks like a sort of hardware fault. Get to the service center, while it's still under warranty.

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