This was happening in the fall too, but an update solved the problem. But the problem just returned today. I can’t get to any of my older recordings through the Apple TV app. (I can watch anything that’s recorded in the last week through “Latest Recordings”. I’ve tried all the usual fixes, redownloading, etc. (If you just allowed the “search” function to find recorded shows, that would be a valuable workaround … )
Sorry you’re running into that @JRB,
Would you contact Tablo Support? They may be able to help.
If you do reach out to Support, would you share with us the SID of your Tablo? You should find it at the bottom of the unit.
You can also DM it to us.