Hey folks,
I just got the Roku Ultra and sometimes when I pause a video the image stops but the sound continues.
The only solution is to go all the way to the home screen and restart the app. I also experienced going to the home screen and the audio of the video continued.
I never had this issue with the roku stick but the ultra seems to be doing it often. It has happened on multiple apps (Disney+, Netflix, and Prime Video)
-AC