I started getting V52 errors on a handful of channels yesterday (like all HBO channels, the Cooking Channel, among others) and have tried everything I can think of (restart TiVo, try component/HDMI cables, re-seat all cables and cable card, re-run guided setup, etc.) to no avail. These channels had been working fine for about three months and we don't have SDV/tuning adapters to muddy up things either. On the channels I do get, signal strength is typically solid at 99% but no signal is detected on the channels that aren't working. Also, my Comcast HSI is working just fine.
I called Comcast and the CSR basically sent the refresh signal a couple of times before giving up and suggesting that I have a tech come by tomorrow to check things out. They are currently scheduled to stop by tomorrow between 8-9 AM.
I'm not sure if there's something else I'm missing. Since I don't have anything else to lose I'm considering calling TiVo support. Has anyone else experienced this and is there anything else I'm missing? My Roamio has been awesome and it sucks that it isn't working properly.