You may have seen an overlapping topic which may now be part of your issue. There’s been a new format problem introduced by the guide provider that has required an update to the Tablo firmware to maintain regular overnight, full guide updating.
I got support to send me the new beta, 2.2.15, and it has fixed the problem for me. (After no guide updating for over a week it has now been updating every night, and I first got a fully refreshed guide by manually updating through settings after installing the new firmware.) I did have to reboot/repower the Tablo after updating the firmware to get proper performance, which has not been true for me in the past.
I assume 2.2.15 will be rolling out as a regular 2.2.16 firmware update soon, but you might want to ask to get the 2.2.15 beta.