Where are you located? All of those channels are carried by a local broadcast TV station. The station may have dropped those networks, or the station may have been dropped by Comcast for various reasons, including "Designated Market Area" issues.
I was wondering the same thing !! I have contacted Comcast C/S, and the two regional managers concerning the same question, but, as of yet, have not received any legitimate reply / resolve. Those channels were viewed a LOT in THIS household, and if not restored, then....
.....that that fiber optic TV & Internet provider ("Metronet") who keeps sending their advertisements to my home just MAY be getting a call from me.
P.S. How am I going to survive without "Svengoolie"??!! (lol) !!!!! ~D.R.
Comcast doesn't have anything to do with it. These are digital sub-channels of over-the-air local stations. Over time, numerous networks of the MeTV variety have sprung up, and it seems the local stations bounce around between them somewhat often. They get contracts to carry them, which expire, and the local stations try something else. Comcast simply re-broadcasts the digital sub-channels, they have no control over the programming. Do some Wikipedia research on these networks for a better understanding of how they work.