My LG 65UF8500 used to play 4k videos through the youtube app without an issue. Now anything maxes out at 1080p, even previous subscribed 4k videos won't reach max resolution anymore. Deleted the app, restarted the tv, no fix yet. Anyone else have any issues or tips? Other apps such as amazon prime plays UHD videos just fine. Seems to only be limited to youtube. Appreciate any help .