My phone got into a bootloop (phone hanged) on Monday while travelling to work playing Pokemon Go.
Went home to try the freezer method for 15, 30, 3 hours and it didn't work. Only managed to boot to login screen but restarted shortly after. It worked again during the thawing process

Quickly backed up my photos.
Pokemon Go was still running in the background. Checked the temperature with CPU-Z and it was at 84 degrees C despite being in the freezer. After shutting down the app, the idle temp was 50-60 degrees.
Went to service centre this morning for replacement and CSO said can expedite my repair within an hour but I didn't wanna wait. Please bring along your receipt or contract. Without any of those, the warranty will take effect from the manufacturing date. Also disable your password once manage to bootup. Overheard another CSO telling a customer that still might have chance to retrieve data if its not password locked (need to specifically request but no guarantee. Be nice to them though). Good luck
First LG and android user -.-
S/N: 510