Since the last couple of updates I’ve had the issue where a channel cannot be shown – selecting a channel via the guide or on now screens will switch channel (I can hear audio change) but the actual selection screen doesn’t disappear. The guide and/or on now screens remain on screen. Force quitting the app doesn’t help and neither did a restart of the Apple TV. Eventually a combination of a lot of force quitting / restarting after about 10 minutes it eventually started working for me. Has happened about 3 times now over the past 10 days or so. Has been rock solid for years prior...
Also tried changing channels via iOS app to the AppleTV with same issue.