I have had my S3 for many years and have had issues with channels not tuning. They will come in as just a black screen. I can usually just use the other tuner and it will come in fine. I bought the new Roamio hoping this would go away but it didn't at first. Comcast just pushed a firmware update out to my cable cards and that fixed the Roamio's issues, but I am still having this same problem on the S3. Is anyone else having this problem?