Ziggo have changed some channel frequencies to a new 256-QAM modulation. It toke for a while to figure out the changes, but I did notice that some channels that where using the 256-QAM modulation did not work anymore.
After a week of testing and reading, I found out that my code did not look at the QAM modulation at all. It turns out, that Ziggo was doing only 64-QAM, so my list was always working. Now the Dreambox Ziggo Channel list software is looking at the modulation and take that in account with the frequency information.
So download the new channel lists and enjoy all the new updates to 256-QAM modulation.