I just uploaded the log files.

@David-TP The new primary device is using two ports: the first one is connected to my ASUS router (the rest of my network is connected to a 16P gigabit switch also connected to the router). the...

I have a set of three Deco M4 devices, configured as Access Points. On one of the Deco M4 devices I connected a Synology NAS by wire. in the deco app the device was always visible, until I set that...