Maybe the Apple discovery protocols interfere with multicast protocol Swisscom TV uses.
The Apple may be set up as a DHCP server.
And then you will get an IP conflict.
You may see more on the router GUI
https://internetbox.swisscom.ch
Greetings Lorenz
Werner I once had a case in the field where someone installed PCLs with an activated DHCP server with a different IP range.
I searched for the error for 3 hours because all 5 TV boxes kept reporting no internet connection after a certain time.
The TV boxes sometimes logged on to one DCHP server and sometimes to the others. It was also strange that the default lease time was set very short (30min).
I only realised this by connecting the notebook (DHCP) to the customer’s home network, where the TV boxes were also connected, because the gateway and the network area suddenly changed.