Apple TV 4 goes on screensaver in some apps
The new Apple TV 4 goes screenasver with the new update to TV OS 9.2. One of the apps is for example "myTuner Radio Free"
Yes, launch the Settings app on your Apple TV and navigate to General > Screensaver. Select Start After and change the time to Never. This will effectively disable the Apple TV Screensaver. You might also want to go to Settings > General > Screensaver > Download New Videos and switch that to Never to avoid having new downloads take up space on your Apple TV.