I got 3 deco M4 device, 1 as main (AP mode) and slave 1 and slave 2. Main deco and slave 1 are located at ground floor while slave 2 is located at floor 1. Main deco is located under the stair so the

I've got a mesh network consisting of two Deco M9 Plusses and two M4Rs. Both are V2. I've got one long-standing issue: per the title, the network either refuses to connect devices to the closest mesh