An issue like that, I’d at the very least delete the YouTube app and reinstall it.
But I’d probably even skip that step and do a complete factory reset of the Apple TV.
I watch YouTube more than I watch regular TV. I pay Google the $10/month to get the ads stripped. And the only problem I’ve had is that rarely a video will get stuck when I’m trying to fast forward /rewind and I’ll have to close the video and reopen it or maybe do the same to the entire app.
I opened this thread hoping you were going to be complaining about the UI. I really wish Google would write an app using the native video player and not their custom written one...
But the reason I say to reinstall the app and really even to do a factory reset, is I’m guessing the YouTube app itself has been corrupted somehow on your Apple TV hard drive. Just do a factory reset and make sure everything is written to disk proper?