My phone keeps restarting/reloading even though I just formatted it?

So my Android (LgG3) has been having some issues lately. It kept on restarting constantly. I couldn't stop it. It would constantly restart and keep doing so until its battery drained unless I had it plugged in and charging.

After looking up some forums it looked like just reformatting it would fix the issue, so I backed up all my data and did so, but after I manually put some contacts back in it restarted itself again after I took it off the charger.

I'm not sure how to tell if this is a battery issue, as some forums said that a battery that wasn't staying properly could be the issue. Some other conclusions involved that the new update just didn't allow Androids to work properly. I'll probably have to take it to get repaired if this isn't fixed soon, but if anyone has solutions that would be great.

Cheers

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