Last night this did not happen to my wife. She was watching this is us on NBC while it was recording.
I was upstairs watching something else and she did not have this happen.
It might be time to open a ticket and see if the Tablo team can schedule a remote session to check the logs from one of us reporting the behavior.
If I experience it again, I'll open a ticket unless someone else wants to do it first. I would mention the show, the time show starts and when it ended so the support team has as much info as possible.
I'll see what is recording tonight and see if the behavior presents. I can tell you, I did not experience this watching a channel that was not recording on the Tablo.