Recording failures from lack of space but HDD is only 5% used

After checking some sources online, I found that the Tablo might just need a restart. If you haven’t done this yet you might give it a try. Also, how old is the hard drive?

Also, clear your Tablo App cache if you’re able.

Tablo TV App Cache - How and When to Clear It – Tablo

Tablo 4 stopped recording all shows “no storage space available” - Support & Troubleshooting - TabloTV Community