IPhone4 keeps turning off itself

I don't know what trigger this. my iphone4 is previously on iOS 5.0.1 and it keeps turning off itself.
but when i plug it to the power, the phone turns on, BUT when i pull the plug off it turns itselff off.
it's like the phone has no power left.
yesterday i connect my "dead" iphone4 to itunes and enter the recovery mode and restore it to the newest firmware (5.1.1) but still the same problem happened.
anyone could tell me what should i do ?

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  If all of these troubleshooting steps have been done and the issue still occurs it is time to take the device to Apple for evaluation.

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