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Sometimes, my iphone automatically turn off after lock screen. I press and hold home&sleep buttons at the same time for 10s and I saw the apple logo on the screen, then its like nothing happen to my iphone. What happened??
Make sure you are not using a jailbroken device. If it is not jailbroken, just restore it to factory settings and that will do. If this happens again it must be a faulty batch (mobile), just send it back to apple for a free replacement if it is under warranty. (Assuming it has not been dropped or liquid damaged)
"Make sure you are not using a jailbroken device." I'm sure ab that. thanks 4ur help, I'll try to restore it.

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