Lg G3 Still crashed and wont go past lg logo after using pc suite to return stock

Hey guys, my lg g3 has been having some issues lately, it started randomly turning of and on again back when i was running cm12 and i got so sick of it i tried to install another rom, after the rom installed the phone booted to the menu and then crashed and wont go past the lg logo without restarting. So i took some advice from mates and tried to use the lg mobile support tool to return it to stock after i have had so many issues trying to use the lg flash tool
The lg mobile support software installs a stock os, then the phone launches and gets to about the entering google play information then crashes and wont go past the lg logo. It stays on the lg logo for about 3 or 4 secs then turns of and repeats this cyle
anyone got any ideas?