How to get my iphone 5 to stop restarting itself?

I have had this phone for about a year with no issues. As of about 2 days ago, it started randomly turning itself off and back on again while in use. I have tried restoring it, reseting the settings, etc. Even when I erased the whole thing, it still had the same problem. I can't even install the latest 7.1 ios update, because it restarts before the download even finishes. The battery percentages seem to be moving like normal, and seems to charge at a normal speed, minus the restarting part. Also when I originally went to restore the phone, it was unrecognized by itunes, so I had to back it up again and basically restore it to it's troubled state. It did not show any other backups to restore it from, even tho I'm sure I made some in the past.

Update itunes restart your computer and restore the phone. Once restored set up as new to see if this corrects the issue. If it does then restore backup. If the issue starts again there's a problem within the backup.

Plug it in

Download 7.1 firmware, enter DFU mode, then restore your phone to a brand new system, done

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