Help LG G Stylo Constant restarting itself! HELP!!

[Brittney Victory]

So i took the back off my phone to tighten some screws thinking that was the source of my gps problem (my gps did not work for some reason), anyways, i proceeded to restart my phone. Normally when my phone restarts the whole "Optimizing apps 1 of 1" thing happens, well it did however it happened 4 times because my phone restarted itself in the middle of it. So it finally got working and then like every 2 minutes it restarts itself. So i just hard reset it and before i can even get my phone settings adjusted or even touch my phone after the reset, every minute or shorter my phone is restarting itself. Please help!!!