My iphone 4 turns off automatically after screen lock

Hello guys,
my iphone 4 turns off automatically after screen lock, i have to press the POWER + HOME button during 10 secondes for reboot.
And it's like that every time i lock the screen.
Please can someone help me ?
thanks.

Standard troubleshooting steps are reset, restore, restore as new.
Since resetting isn't working, try backing up and restoring through iTunes.

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