BOLT: One tuner is not working

I'm having a an issue *all of a sudden* on my TiVo Bolt. ONE tuner is not functioning at ALL (all channels show error V53), whereas the other 3 are working just fine. I have Comcast and spent an hour on the phone with them re-pairing the cablecard with this Bolt. We even tried my other cablecard from my Premiere (where all 4 tuners work fine) and the same thing happens (one tuner does not function) when it's paired to the Bolt.
I have 92% signal strength and 37dB SNR on all of my...

BOLT: One tuner is not working

BOLT: One tuner is not working