These bugs and annoyances have been present ever since the major redesign of the Channels tvOS app.
Sometimes, after rewinding and fast-forwarding several times in succession, the sound will develop a glitch where the audio drops-out briefly every few 10's of seconds. The only way to fix it is to bail out of the program and re-enter. Of course: If you're watching Live and are behind the timeline, well...
Speaking of timelines: Occasionally the progress bar at the bottom stops showing up. Again: The only way to get it back is bail out of the program you're watching and...
Occasionally, instead of asking "do you want to watch live or recording?" it asks "do you want to watch from the library?" Huh?
Occasionally fails to indicate a program is recording when, in fact, it is.
TBH: I wish we could have the old app back It was much more stable. And, in both my wife's and my opinions, more user-friendly.
Related: Don't know if this is a Channels bug or tvOS: If you're watching something on Channels and fire-up screen mirroring on, say, your iPad, when you stop screen mirroring Channels is frozen-up solid. Only way to get it back is, yup: Bail out of the program you were watching and... (I thought you used to be able to do this and Channels would pick right back up, but I wouldn't swear by it.)