My g pro 2 after repairing wifi keeps crashing on boot

Jul 1, 2015
35
3
0
Hong Kong
As we all know that LG G Pro 2 had an issue on wifi,bluetooth and overheating,So i brought it to china to fix it and they replaced the motherboard(idk i just tell my friend to help me to fix) .And everything works at the beginning. However when i open up the wifi,the system lags up,and reboot.At that moment i am using cm 13,then i thought it was a software problem,so i installed rr 5.8 and the first boot just lag on the boot animation,and then reboot.And the second time the system boots up,and wifi works like a charm.

So my phone is now depends on luck to boot up.Sometimes it just lags on boot animation,then reboot.And sometimes just directly startup normal,(excpt the crashes forces the system to reboot after usong for serval hours.)
So is there any ways to fix it?