HT4623 iphone wont power up 4gs

iphone wont power up

I had a similar problem with my IPhone4. I plugged it in to charge and it turned itself off and would not restart.
I took it to a genius bar but they couldn't get it to restart and were going to charge me for an exchange as it was out of warranty.
I tried on and off, lots and lots of times to reset it and after 4 days it suddenly restarted but with a very low battery warning. I then charged it up and managed to get it working again, although it shut itself down a few more times over the next couple of days it and I had to reset it. The last time was very strange - I was listening to music when the phone suddenly started to vibrate for several seconds as if it was receiving an incoming call and locked up. I had to do another forced reset to get it to stop vibrating.
Since then the phone has been working completely normally.
This was over three weeks ago.
I think it was a software issue and something to do with ICloud.
Hope this helps

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