Same thing happen to me on my LG Oled 55 incher EG910, it occur on its 2 1/2 year so no more warranty, panel also cost 90k, loved so much that TV that i bought again an LG OLED 55" C8, it still under warranty up to Feb 2021, hope that it doesnt happen again or else i will go back to a LED TV and just choose the high end or full array just to be near Oled picture quality.