@YouTubeTV started noticing the other day that the YouTube TV app on AppleTV is not staying on my Live Channel list. Every time you select a channel watch for a few minutes and go back to the list it is back on the default list. Known issue?
Sorry to hear about this – sure, try it on a different TV. If you're still having the same issue, reach out to our live support team. Here's how: https://yt.be/help/S7Hu . Thanks for your patience!