How do I fix my iPhone 4 that's keeps turning off and on

My phone keeps turning off and on. It will show the boot logo and it will dim like its going to the lock screen, but then it will show the loading wheel when turning off. Then the process repeats. I trued restoring but in recovery mode its gets error 21 at the step of getting iPhone ready to restore. Then I tried to do it in DFU mode and it gets stuck in waiting for IPhone. I have tried changing cables that hasn't really worked and I tried updating everything. Please help!!!!!!

Sounds like you have a hardware problem. Take it to an Apple Store for evaluation.

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