Get 3 iphone 4 (2 black and 1 white) all them have a 1 problem .. turn off alone.. and i can t turn on but the use the lock button   home button .... every day he turn off alone (3 times in a day_ im very tired and i want a real solution of this problem

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Try a reset by pressing the home and sleep buttons until you see the Apple logo, ignoring the slider. Takes about 5-15 secs of button holding and you won't lose any data or settings.
You could also try a Restore if the reset doesn't work.
You may have defective batteries.  Were these purchased new?

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