Suddenly overnight, the MAIN DecoM9plus is trying to serve all devices. Satellite M9Plus antennas have zero devices connected. ALL satellites have green lights and show as "Healthy" in the app. I've rebooted everything multiple times. I've rebooted the router multiple times, and powered-off and on the tp-link switch serving the ethernet backhaul. I have both ethernet-connected and wireless M9 satellites, and all are behaving identically. I added a new ethernet -connected M9 (I had a spare) and it has the same problem as the other satellites.
 

See screen grab showing how the Satellites have no devices.

Please help me fix this, oh wise community.

thanks