@Symph Could be hardware issue with "Garage congel". Try the following: 1. Delete "Garage congel" from Deco mesh, which will also reset that Deco unit. Follow Reset a Deco unit from How Do I Reboot...

@dickymoo The point of this exercise is to find if forcing laptop and desktop on WiFi5 exclusively will fix the issue with them not connecting to the nearest WiFi mesh node. If you can't afford to...

@zilbi I am assuming you checked Ethernet cable and it does not have issues. If you haven't checked it, you should do that: connect something to that cable (laptop, etc.) and see if it gets Internet...

@LukePL You are saying that when Deco nodes on a certain floor are wirelessly connected to the rest of Deco mesh, this somehow messes all office LAN, wired and wireless. This is easy to test: when...

@dickymoo It is possible your laptop and workstation prefer 2.4GHz WiFi band. This band is slower but it can allow devices to connect on farther distances. Disable 2.4GHz in Deco Main Network,...

@Ranb There is something strange going on, because with that network diagram there is no way devices connected to the switch will get IP addresses from Host Router. This is what I would suggest:...