I’m thinking this is the same issue I’m running into - as reported here, Video Freeze at 10min on All Videos & 2 Shields - V1.18.8.2468
One thing that worked for me however, was to “Uninstall” Plex on my Shield, then play a movie for more than 10 min. Then, I updated the app, and have been able to play everything again w/o issue on both the non-advanced player, as well as the advanced. I’ve been testing it for hours now w/o any more freezing.
