Hello. 

This is an absurd situation and I cannot fix it.

I placed the 3 pack Deco M4 routers at home. One of them in my first floor. Another on my 2nd floor. The third one on a playroom outside the main house. 

The M4 on the 2nd floor is a nightmare. It's on an open hallway. All rooms have doors. Plenty of walls. Anyway.

My devices are working OK, and suddenly I go from, say, 180mbps to 0.0001. If anything.

I've noticed that what is happening is that devices connect to the M4 on the 1st floor, very far away. I lose all cojnnectivity. And devices tend to stay there. On the slowest M4.

This is absurd to no end. I don't want my stationary devices hopping around my network and I have no clue why this is happening. I don't want to turn off mesh functionality because that's the reason why I got a mesh system in the first place.

But as it is, it's unusable.

I've tried playing with beamforming and fast roaming, tehe only options I have. It seems not to affect anything

Please, someone help...