@David-TP Hello David, thank you very much for your reply. I have tried what you suggest but it has not solved the problem. As it was under warranty, I have returned because I think it is defective....

Hello all I have a wifi network made up of 3 x M9 Plus decos with this setup: Main deco is connected to the router. It is located in the ground floor 2nd deco is in the first floor. It is connected...