@David-TP Thank you so much for the quick reply! Yes, the network layout is exactly like the one you posted and the LED light on the Deco M5 does turn blinking red when disconnected from the network....

Hi there, My current Mesh setup consists of the following: - main Deco M9 connected to my ISP's modem/router on the living room, set to Access Point mode; - a TP-Link unmanaged switch, model SG105,...