Well, after two months going crazy, I managed to fix it .... the fact is that one day, because if it started to warm up the phone like crazy, the battery lasted 1 hour .... after restoring a thousand times, reset thousand more, replace the battery and still exactly the same .... take that out version 7.0 for developers, and got. Problem solved! Moreover, as yet not very well going 7.0, I did a downgrade to see what happened, and now I'm back to 6.1.3 and it works like the first day! Hope this helps .... so if you have to say is that it is a shame that Apple has these errors .... in fact I try to send support 160e and charged me not knowing if I could fix. by .... true, mine is a 16 gb iPhone 4 gsm