Roamio to computer and Series 3 transfer problems, Comcast?

Lately I've noticed transfers of some HD recordings from my Roamio to my computer (using Tivo desktop) or to my Tivo Series 3 (HD) are not working, it is transferring but only audio, no video. Only HD recordings I've noticed and only certain channels, I've noticed SYFY, Hallmark and a couple others. So far it seems the major network recordings are still working/transferring correctly. I wonder if this has something to do with Comcast changing their output format? I did perform a test, a recent SYFY HD recording does not transfer correctly, only audio, no video. The original show was about 3GB, only about 300-400MB transfers (I assume just the audio is why). Tested transfer to computer and to Series 3 HD. I then transferred an older SYFY HD recording and it worked fine, audio and video. So maybe this has to do with Comcast changing the signal crap? I like to save some shows/movies to computer, if can no longer save HD recordings to computer from most channels will not be happy. And who knows, maybe the major network HD recordings next? Anyone having the same problem?