Same thinks been happening with me for various channels. Annoying as I've missed a few things because I've forgotton they are on. One day I had 2 pages of links the next just 4 programmes. It's disappointing.
i've only linked simpsons and voyager on sky 1/mix atm...lol...so i have yet to experience other channels link abilities....might test it to see if i get problems...save me relying on it in future for something important....lol