I have had a local stations digital transmitter malfunction, and they wasn't too concerned about it until I called and asked. They said, oh, people really are watching digital. Doh !!!
Another case was a local ABC station who wasn;t transmitting in HD. I called, they said, well we have an issued, can't get 5.1 to work with the HD turned on, would you rather have stereo and HD picture or 5.1 with standard, I said HD picture, so they changed it just in time for the Grammys and it's been that way since.
I would try to call someone who can see if they have the same results, then call the station, just ask for their engineer.