picture and sound interference

For the past week, I have been having intermittent sound and picture interference on several channels (TCM, FNC, and SEC Network). Sound cut out for a second and also I get bands of color interference that also last for a second or so. Other channels do not seem to be affected. I am trying to find out if there is any Xfinity issues with these channels. I have tried troubleshooting with XFinity Assistant but that has not been helpful. I am trying to find out what is causing this issue.