mobile

Hey guys im hoping to see if anyone can find a solution to this annoying problem i am having with my phone rebooting on me in the middle of using it. The phone would reboot once in a while and i never thought much of it, but recently(this past week) its been happening way too much. Im using my phone and then it reboots, but it goes into somewhat boot loop. it restarts anywhere from 1 time if i am lucky to around 10 times! once i get it to stop rebooting i use it a bit and it reboots on me again! This was happening in the stock LG OS and i got annoyed and flashed a lollipop rom and its still happening but it only reboots once. However if i start using it it reboots. The phone is becomeing essentially unusable!!!:( I then started to notice that if i am connected to the charger my phone does not reboot at all! no problem what so ever!

Any ideas of what i should do?
Is this happening to anyone else too?

I was thinking about unrooting it through TWRP and then upgrading it to the latest stock OS but i dont want to unroot it if i dont NEED to.. Any input is greatly appreciated