Mauwika
This is 99% a message from the TV itself.
It could be that the TV is reporting that it is receiving HDMI-CEC control commands from the Swisscom box. You can deactivate HDMI-CEC in the Swisscom Box.
Does the message remain permanently or does it disappear after a few seconds?
Uncle Google finds a lot about this message on Philips TV’s……
….keep on rockin' 🤘🏼🤘🏼🤘🏼