I am seeing a similar issue with OTA, first noticed over the Labor Day weekend. We mostly only watch the local weather OTA radar stations, and record some programs from the PBS station.
I see the pixelation and sound issues with playback of OTA content. As well as when watching it live on both Joey 2 that we have. Not issue watching live OTA on the Hopper 3 itself.
If we have a OTA station playing on a Joey 2, I can go join it on the Hopper 3. No issues on the Hopper 3, and the Joey 2 will then stop pixelating. If i try to watch the OTA channel, on the Joey 2, the next day, it's back to pixelating.
I currently have the old single turner adapter, but have a dual tuner coming.