I sometimes find the need for some way of stopping apps running on Apple TV - not just custom apps, but even the out-of-the-box Apple apps for watching TV shows and movies because they can become unresponsive or not pull down content for one reason or another, leaving a spinner up on the screen and only allowing me to return to the home screen.
Is there any way of using the Siri Remote to kill the app and relaunch it? Sleeping and waking up the Apple TV also does not appear to help. It would be annoying to have to power cycle the Apple TV in these scenarios...