if you have digital cable meaning you have a box , i think it is those channels you have mentioned that are the source . i have seen how regular analog cable can have issues like that , that seem to be isolated to certain channels , but if you have a box than chances are you have digital cable . i think digital cable is superior to analog in a lot of ways . and the issues these channels are having are probably the channels own issues.
funny , but useless . the town i grew up in , on the disney channel or channel 19 , the police radio would bleed over that channel