Well, I removed the coax that used to go the recordable DVD writer that had a NTSC tuner and was removed from my system when all the NTSC channels switched over to ATSC. It might have been acting as an antenna that fed back enough signal (since my locals are only a mile away) to cause multi-path on the OTA dongle. It remains to be seen if that helps, though, as after I came back to the 4K Joey and I saw that the NBC channel was still having problems. None of the other channels, did, though.
Also, if I was having problems with 016-01, shouldn't I see the same problem on 016-02? Maybe it's the lower bitrate since it's SD, but I watched as much "Green Acres" as I could and I didn't see a glitch.
Here's another issue I noticed. If you right-arrow to bring up the quick browse and up/down arrow to an OTA sub-channel with no EPG data, if you select the channel it goes to the Record screen instead of tuning the channel.