I've had my G6 for just over 6 months, no issues at all.
My son ended up getting one back in August when Best buy offered them for $120 ($5/mo for 24 months). Yesterday he was trying to install latest firmware from Sprint that included the November security patch, but instead got the dreaded bootloop. Called Sprint, tried to reset pressing power and volume down button, but splash screen blinked several times, and then showed this screen.
Sprint referred me to LG, and now his phone is on its way to Fort Worth for repair/replacement. I had the doomed G4 and went through 3 devices with the dreaded bootloop issue, but this is the first I've heard of any issues with the G6.
View attachment 277299