TWC + SDV weirdness on Roamio Plus

I'm on TWC in Southern California. Today, I'm seeing something new to me on many, but not all, SDV channels. The picture is coming out "scrambled". In other words there is a picture there that you can barely make out, but it has very high levels of digital artifacts. There is no TiVo error message and also no audio. I don't think it's the tuning adapter itself, because some SDV channels do come in just fine.



I called the TWC cablecard number, and the very polite young lady there went through the TA diagnostic screen with me and sent a reset to the device from her end, all to no effect. She suggested swapping out the TA.



Has anyone else seen this before? Any suggestions?