Today, our Hallmark HD is completely missing. We have reset the TV box per the troubleshooting, looked it up on the Hallmark Channel website, typed the channel number manually and everything says it doesn't exist anymore. The regular Hallmark Channel is there but very poor picture quality. We checked all the Xfinity channel lineup information and it is still listed there.
We went in finally to our local Xfinity store and the employees there had not been told anything about Hallmark HD. They were frustrated as they couldn't help, but advised us to call corporate and complain.