The next thing I’d look into: force close the app (described here by iMore) then restart it .
How to force-close an app with the Siri Remote on Apple TV
If an app is acting up on Apple TV, you can use Multitasking to force-close it. You can open Multitasking from any app or screen, but for simplicity’s sake, we will start from the Home screen.
- Turn on Apple TV.
While on the Home screen, double-click the TV button on the Siri Remote. It is the top button on the right side of the face of the remote with a TV icon on it.
- Swipe to the right on the trackpad to find the app you wish to force-close.
Swipe up on the trackpad to force the app to close.
To exit Multitasking, press the Menu button on the Siri Remote, which is the top button on the left side of the face of the remote. It has the word “Menu” on it.