Tuner not available - randomly

Random question, all of a sudden on certain channels I’m getting Tuner not available messages or something more wordy (see pics).

Do I just need to rescan these particular channels?

Your apple tv is running out of space I think in the first image.

Nope, very little space used on a 64gb version… less than 10 GB.

Should have added the second image is what the message shows on the iOS app.

Try the official HDHR app to see if it can tune. Maybe a signal issue