This has happened several times - I set the guide to “Sports”, watch for a while, now there is just one channel that matches Sports, but I can’t change to any other category. I’ve restarted the AppleTV several times, but I can’t change categories. In the past, restarting “fixed” the problem, but this time nothing has worked. Usually the menu button takes me to the category list, but now it takes me to the left most menu.
The attached photo shows how it is “stuck” on Sports.
