I have an LG OLED from 2017. It started getting really bad screen burn/pixel degredation just after the 6 year mark (6 year warranty), I did a quick search on Youtube, and lo-and-behold, a whole bunch of other people, with the same model, started having the same screen burn-in issues at the same age!

It covers the middle third of the screen, top to bottom, and the entire bottom 1/4 of the screen with some odd spots as well, it's really distracting and essentially makes the TV useless (to me).