mobile

It's going to be my first time posting here since I can't find a clear solution that I can follow and I'm desperate to get it fixed. So the thing is, my G3 is in an infinite bootloop, it just restarts over and over again, the LG logo only shows up for a split second then restarts again. The only thing I did was root it and use the G3 tweaksbox. After sometime my phone suddenly restarts when my battery is low or when I run to many applications, so I see that as a normal issue. But then at one time it just restarted and the loop began. I use a D855 variant btw. Any help is greatly appreciated! THANKS!