I have the Spin channel in my favorites. When I hit play, it’ll play for a few seconds then freezes at 33%.
I have to exit the app, then go back into it to restore operation. It does this on all of my Roku devices around the house.
This particular instance is on a Roku Streaming Stick Plus(model 3830R) with firmware 15.3 and Plex app version 9.18 build 13.