Black Screen on Some Channels

I have a Roamio Plus using Comcast in Minneapolis. In the last few weeks, I've had issues with certain channels showing a black screen with a message that I don't subscribe to those channels. I can fix this by powering down the TiVo and then rebooting it, but it's annoying. I've had no problems before this.



Could my CableCard be going bad? Any other ideas?