Cablecard Issues - Pixelation and Dropped Channels

I recently switched from Contour to a TiVo Roamio with Cox CableCard.  I also have the SDV Tuning Adapter.  I receive all my channels, but I am frequently running into issues where the video will start to pixelate and the audio breaks up. That is usually followed up by the channel dropping and the "Searching for a signal on this channel (V52)" error.  This happens randomly, but frequently (at least once per day). Sometimes if I flip around to other channels then flip back to the problem channel, it will come back.  Other times it will go out for a long time.  Restarting the TiVo box doesn't seem to help. If I perform a re-pairing of the card and box while on the phone with tech support, as I have done a few times now, the problem will be temporarily fixed but will resurface a day later.

When I first got the CableCard and tuning adapter, it took me a few calls with Cox Tech Support to send a firmware update to the tuning adapter and a few hits to my line before I was able to get all my channels.  Now I receive them all but get these pixelation and dropped channels issue.

Has anyone else experienced this? Any suggestions other than calling tech support (again)? I'm starting to get really frustrated at the lack of reliability from the channels that I pay for. The signal strength is always coming in at 99%-100% so I dont think it's a signal issue.  Could I just have a bad CableCard?