One channel keeps freezing: How can I troubleshoot?

I'm new to TiVo but I have a Roamio Pro and it's working great except one channel (and only that channel) keeps freezing.



It might not freeze for an hour, but then it might freeze for a second, and then freeze again a few seconds later.



What can I do to troubleshoot? I looked in the DVR Diagnostics area and that tuner shows 100% signal strength with -40 dB SNR.