PBS channels breaking up
We receive two PBS channels through Comcast: 1) KSPS, Spokane, WA; and 2) Idaho Public TV. For the past several days, the signal for both of these channels have has been very choppy, constantly breaking up in both the audio and video.
All other channels we receive through Comcast are solid and smooth. It's just the PBS stations.
Any ideas about what is going on and what the fix is?