Roamio's tuned to channel 0

Weird thing happened on both my Roamios today......I went to turn on the tv and it was a black screen. Pressing info showed the TiVo was tuned to channel 0. Just on that single tuner.



Both Tivos show they haven't rebooted recently.



Any ideas?



No other issues I see. Both are on the latest 20.4.1.



-Kevin