We’ve only seen this in the past with some sports airings. The reason for this is because some last minute guide data changes can cause the Tablo (improperly) drop the airing since the airings info has changed. It’s possible this episode had some kind of change implemented that caused this, and we’re working on fixing this.
There is, however, a work around which we’ve seen work:
Set the series to record instead, using the ‘Rec All’ function. Then, de-select the airings you don’t want to record.
Let me know if you can try this - or if you already have.