My iphone 5 dies at random percentages and takes forever to charge?

I've restored it… Didn't work. I took it to AT&T and the lady said it was because I left to many apps running so I close them all now… Doesn't work. I don't know what to do I got this phone in July of 2013. Any ideas of what to do/ what's wrong with it?

Do you have a local apple store go see them or call att warranty as they are more aware of the issues going on with the phones and might be able to send you a new phone refurbished or connect to find the issue. Just make sure you hace no water damage or cracks or scratches thats deep

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