Hi. Looking for help. Setup 3 Deco M9 plus devices. One connected to my router and the 2 satellites connecting to main deco via WiFi.

I am using the satellites to connect to Sky Q booster and Sonos speakers via ethernet. The problem I have with one of the satellites is that whenever I connect it to a sonos device it changes the connection to the main deco from WiFi to ethernet. Its as is its trying to receive signal from Sonos rather than provide the speaker the signal??? The other satellite works as expected by retaining its WiFi signal back to the main deco when connected to sonos speaker.

Has anybody encountered anything similar and how did you resolve to stop the satellite inadvertently thinking its connected to main deco by ethernet when its not?

Thanks