[billydee]

Originally Posted by Tower Guy

Guess #1; The TV set remembers the old channel info and is confused. Try a double rescan. https://www.soundandvision.com/news/061809dtvweak

Guess #2; The 18.5 audio channel (https://www.aincolorado.org/) is improperly set in the PSIP tables. Call or email the station for assistance.

I forgot to mention I tried the "double rescan", twice and on both Vizio TVs. To no avail.

Have not yet dug into your second suggestion, especially since it appears to be a Vizio issue. But maybe that issue is related to that, and Vizio just doesn't handle the conflict very well.