The symptoms, cause, and resolution presented in the article at this link do not in any way match the issue described in this thread. (Although I have also seen these symptoms very briefly and very occasionally.) I wonder who marked it as 'accepted as a solution'.
For unrelated reasons, I moved my PVR temporarily to a different room and attached to an older, non-smart TV. I do think that it has a 60Hz refresh rate, based on a google search, but it is 720p and was connected over HTML instead of component video. Watching Book Of Negros on this TV did not exhibit the choppy motion symptoms that it did with the normal setup. The PVR is back to the old setup now and I will watch for the symptoms. The new CBC show X Company does not seem to have the problem.