@Alexandre. If the main Deco is not bounced, will it answer to DHCP requests from its WAN port?

@Alexandre. I assume that, in the scenario you describe, the ISP router detected another active DHCP router because the Deco forgot where was its WAN port, and acted as a DHCP server on that WAN port...

@Tomee7 When the app does not connect to the Deco, it often helps to restart the app. Instead of changing the DNS config on your modem, did you try restarting the modem?

@latas2002 Did you verify via the app that Deco Unit was setup with a different configuration that you did? Or did you just observe it was acting as a DHCP server when disconnected from Internet?

@Xequtor I am wondering what are the obstacles to the wifi signal. That should guide where to position the Deco. If the walls between the rooms are the main obstacles, moving Deco E from room E to...

@Xequtor How are satellite Deco D and E connected to the main Deco? Via PLC as well as wifi? To have a good PLC signal, it is recommended to plug the P9 Deco directly into wall plugs. Can you test...