It could have issues after this many years. I think you've done what you can. Time for a new phone.
So I have searched the web for solutions concerning this, I already know that the best option is a factory reset, which I did -twice- but it didn't solve the problem, I still get a popup saying "LG System has stopped working", Safe mode doesn't work either.
I was wondering if someone could guide me as to what I can possibly try doing next, or if I can't do anything about it at this point