I have had a very odd situation happen several times. We record several shows on several different channels on Friday evenings between 8pm and 11pm. Our channels are out of Charlotte, NC. We record Grimm on NBC 36, Last Man Standing on ABC 9, and Hawaii 5-0 on CBS 3.
Open a Support Ticket. Have Tablo log into your Tablo and let them take a look at your logs. That will likely shed more information.
Any chance multiple shows are being recorded at once and he runs out of tuners to record?
Grimm and LMS are on at 8. Hawaii 5-0 is on at 9. I have a 4 tuner so tuners shouldn’t be an issue.