@TASan You should replace Ethernet cable that connects Main Deco to the router. When you restart Main Deco, it negotiates gigabit speed with router over that cable. Later, due to issues with cable...

@Foxhill If you are replacing hardware, no need to delete the existent network. Add single X10 as Satellite Deco to your existent network. Promote that X10 to Main Deco, you may see prompt to do that...

@Rafou According to hardware specs for switch Unifi USW-Pro-48 I can find on the Internet, that switch does not support 2.5Gbps speed. It supports 10Gbps or 1Gbps. For that reason BE25 is forced to...

@ScrnName In Deco app, under WiFi Settings/Network/Advanced/Band uncheck 2.4GHz, which will make devices roam between Deco nodes faster:

@Dizzetiid For troubleshooting purposes, configure Deco mesh to run in Access Point mode and see if all Deco units start using Ethernet backhaul. See...

@M4D Has anyone seen Decos reject Ethernet even when laptops work fine? Yes. If your Deco mesh runs in its default Router mode with Main Deco connected to ISP router, you might have Satellite Deco...