I have a Roamio and 3 Minis. Today each of my Minis had grabbed a tuner. I had not been using them. I am running 20.7.4.RC42-848-6-848 on the Roamio. This has happened once before where all 3 Minis grabbed a tuner from the Roamio with no interaction from me. Pressing the TiVo button on the Mini's remote releases the tuner as expected. I there something being "pushed" from TiVo that wakes up the Minis and makes them request a tuner? I should have looked at the TVs attached to the Minis to see what was presented there but didn't.