My iPhone keeps turning itself off and it sometimes don't come back?
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I got an iPhone 4 as a present from my mum. It was all working fine for a few months and then things started going downhill. It would turn itself off once a day for some strange reason and I didn't think nothing of it as the phones obviously quite busy and might crash every now and again. But after time it started happening more and more. Like for example it would turn itself off every 10 minutes for a day and then the next day every 2 hours. After it turning off I was able to turn it back on, but soon it got worse. Everytime it turned off and I try to turn it back on it would say connect to iTunes, I then tried turning it back on again and it would come on! But recentaly it's got worse, it turns itself off every 5 minutes and I can't most of the time turn it back on. So the other day I connected it to iTunes like it said and it came on fine, it stayed on for at least an hour and then went off again, I've had it on charge for days now and it won't turn back on! I don't know what to do? Can this be repaired? Can apple fix this? Or is there something i can do? Please let me know, this is vital, many thanks!