Update: even after setting up a whole new network and switching the 2 Deco units, I have the same problem as before: all devices are only connecting to "main". What's odd: the satellite unit is still...

@David-TP Hi! I did submit the logs, but not sure if that will help, because I just installed the whole network from scratch and switched the two decos to see if the problem persists. So the logs...

@Alexandre. Tried to switch main deco several times, but always get a "setting not saved, please try again later."

@Alexandre. Thanks for your quick answer! It seems it's connecting to living room with both bands

I have 2 Deco X50 in a small appartment, main in the living room, satellite in the hallway, closer to the 3 bedrooms. At first everything worked as expected, bedroom devices connected to the hallway...