Thank you. I found the solution to the problem I was experiencing, but it took a lot of searching. Now it works well.
Note, this still doesn't tell the world of Roku users how to file bug reports. There really should be a very clear, easy to find statement about that. I could not find one.
The problem I was experiencing is the AppleTV channel/app would get stuck, very frequently. Sometimes it would work for less than a minute before getting stuck again. Once stuck, it never recovers on its own. Going back to Home and then back to AppleTV, it would work again, but sometimes for only a minute or a few. Power cycling the whole box gives the same result. This happened *always* and *only* with AppleTV. Never with any other app/channel. Internet performance to the Roku is extremely good.
The solution turns out to be — found it eventually — is: (1) remove the AppleTV app (2) restart the Roku using the Settings software restart function and (3) reinstall AppleTV. Then you have to sign in to AppleTV again. After that, the problem is gone. That implies that the AppleTV update function did not work correctly in the past — it must have left some trash lying around that corrupted some constants or some code.
