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I had some errors in the igmpproxy logs:
Feb 08 13:40:57 UXG-Pro udm-iptvd[2307]: The source address 195.121.94.212 for group 224.0.250.64, is not in any valid net for upstream VIF[0].
Looking for this online, it seems that KPN changed or added something. See:
https://community.kpn.com/kpn-tv-11/ontvangers-blijven-hangen-op-80-na-update-modem-626696
Adding to the NAT rules 195.121.0.0/16 showed no more of these messages in the logs.