My iPhone 5s keeps randomly shutting off and restarting. It can either be in use or just sitting there and it will turn off. I can't figure out what is wrong.

My phone randomly shuts off. I will be in the middle of using it and it will completely turn off. I can also not have used it all night and I will pick it up and click the home button and then it will flash the apple restart screen. I'm not sure what is causing this as I have only had the phone for about two weeks. It's a little concerning and just wanted to see if anyone knew what it could be without me having to go into the Apple store.
Thanks!

Try This...
Close All Open Apps... Sign Out of your Account... Perform a Reset...
Reset  ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
If the issue persists...
Connect to iTunes on the computer you usually Sync with and Restore
http://support.apple.com/kb/HT1414
Make sure you have the Latest Version of iTunes (v11) Installed on your computer
iTunes free download from www.itunes.com/download

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