Since I moved in with my Girlfriend I have the feeling someone else is controlling the volume of my Sonos setup. In this I see the level of the Sonos controller going to full volume and back to no volume. I can literally see the level of the volume going up and down.
After the first experience I have completely replaced the network with new cabled network and Synology routers. In the logging of the router I don't see unknown devices entering the network.
It is possible to control the Sonos devices in another way?
How can I detect and prevent this?