Channels should behave more like a normal DVR. By that, I mean if I have a live streaming source playing in a window while I am going through the menu to find something recorded to play, when the recording finishes, Channels should return to that window or back to the menu with that source still streaming in a window.
I think this would give it a more “solid” feel. As it is now, when recording finishes, it goes back to the last menu screen with silence. This might be OK for an app on your computer. But it is not good for an Apple TV where it is supposed to act like a DVR because it replaced your Dish Network or whatever DVR.
Edit - unless you were watching a TV show recording and you have that “auto play next episode” setting turned on. Then, obviously, it should go to next episode until you run out of episodes.