This is very odd.
I recorded The Office last night, The Return. Part way thru, TiVo dumped me on channel 3 with an EAS test and stopped responding to the remote except for the yellow circle flash on the panel. Eventually I got back control after 15 min or so.
I tried watching the recording again. Same thing - but w/o the EAS. I rebooted.
Then I tried watching the same episode on Netflix. And it happened there too (no EAS).
TiVo support is saying this is happening on Comcast all over Texas.
This looks like may be a cable card issue where garbage is being sent by Comcast, sometimes garbage looks like CC commands and TiVos don't know how to handle.