@David-TP Thank you for your quick response! I'm planning to add a few more Decos to my system in the next few weeks, so this information is invaluable! I moved the misbehaving Deco to another...

I have 2 new Deco X90s and 2 new Deco W7200s connected via Ethernet in my house. Three devices are all connected via Ethernet to the main router via a switch. Ethernet Backhaul is working on the two...