My iphone 3gs 8gig keeps on turning off and on by itself. i already turned it off and on a lot of times but  it still does'nt work...........please help me with this problem

help me

You said that you restored it.  "forgot to mentioned that ive tried all of that"
When you restore, you can restore from backup or as new.
Did you or did you not restore it?
iPhone User Guide (For iOS 5.0 Software)

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