I just had this issue for 3 weeks. FInally contacted Comcast/Xfinity and through speaking with Technical Support I was able to get it resolved. I asked if this happens again, what do I tell the Tech Support people to get it quickly resolved so I am not on the phone troubleshooting for an hour? They told me to tell Tech Support that they need to REMOVE SCATTER TONE This TOTALLY FIXED IT!!! WOOO HOOO!!!!