@ShapePivot Deco X50 should be compatible with X80. Other Deco models worth considering are X10, X20, X55, X60, and X50-PoE. With larger model number you will usually get better performance, meaning...

@bemak187 In Router mode, this is how Deco units should be connected: If this is what you have, you'll need to check connection between Main Deco and switch. What you describe matches the problem...

@bemak187 Do you run Deco mesh in its default router mode, or in access point mode?

@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...