Hi, I have a deco m5 setup here. One as main, connected to the “internet” and two other, all inside a network with two tplink switch. All three deco are connected by wire.

All works, no speed or disconnecting happens.

My problem is that one of the devices (a deco that stays in the living room, main one is inside a office and the other in my bedroom) does not accepts any WiFi connection. I can roam from my office to my bedroom and WiFi keeps working. But if I go to the living room, it gets a weak signal. If I turn WiFi on and off on my phone, it tries to connect to the Mai deco. 

Living room deco keeps a green led, deco app shows nothing is wrong.

What can be the problem here?