This is a temporary fix to attempt to try to fix the boot loop problem due to a loose connection on the board over time. I do apologize for the crappy video. Since this is my first time doing something like this. Hope this helps out people that need to get their data off their phone.
Once removed the mainboard from the phone, use your oven and bake the mainboard with the processor chips facing up at 400° for five minutes. Let cool for at least a half an hour and give it a try please make sure that you have a full battery and all the needed drivers installed in order to get the information off your drive before it reboots again.
This fix worked for me in may work for you this is not a permanent fix either
Watch video LG G4 Boot Loop (Temp) Fix online without registration, duration hours minute second in high quality. This video was added by user Bradley K 21 February 2016, don't forget to share it with your friends and acquaintances, it has been viewed on our site 99,009 once and liked it 213 people.