I personally went out and bought Roku Ultras from Sam’s Club while it’s on sale. It’s been Flawless for the past 2 days, literally no buffering or any hiccups with the Plex app, it just works! If you are on beta 8.15, I’d recommend trying to go back to 8. 11 which is a little more stable. Or just pick up a cheap Roku, I think they’re called premiere for now until they fix the Android application because even 8.11 has problems. At least we know they’re working on it, but it’ll take time to sort out. You can let them know you’re having problems in this forum.