@Stumpee Deco mesh does not like devices with static IP addresses configured on them. I'll tell you how I configured my Synology NAS, and it runs just fine since the beginning. You decide if you just...

@IliasA How many Deco nodes you have in total?

@roverdublin Yes, you should configure Deco mesh to run in Access Point mode. That will delegate IP addresses management to the router you have. Everything connected to Deco units and Deco units...

@StefanoBau Is it possible your Satellites are too far from each other? Do this test: place both Satellites in same room with unobstructed view of each other, see if they follow connection preference...

@AzaNZ Neither one of new routers is going to join Deco mesh. You can have same SSID, but it is like deploying two independent WiFi routers with same SSID. You can google to find why having two...

@Kirkybaby When you are adding Satellite Deco to your Deco mesh, it must be able to communicate with Main Deco. Bring new M5 to the room where Main Deco is, power M5 on, do not connect it by Ethernet...