I've never had that happen with Hallmark and the wife has that on often. TCM, however, does it all the time. I was up at 3am today so I gave it a shot. The pic froze for 7 seconds then broke up before returning to normal. I hit the Back button and there it was in the recording as well so it's coming from the signal if the DVR captures it.Also here.
The various Hallmark channels also do this regularly.