@newmoro What is the switch brand and model number? This is what you can do: 1. Power off Satellite Deco that is connected by WiFi. Restart another Satellite Deco and check after the restart how it...

@newmoro This behavior is not normal and may be caused by loss of Ethernet link between the switch and Main Deco. If you power off Satellite Deco that is connected over WiFi and that forces another...

@Ken_B You said you Main Deco is wired to router. In that case, you can switch Deco mesh to Access Point mode: Switching a Deco to Access Point (AP) Mode After that, check speeds again. If problem is...

@Henkan Let's start with troubleshooting, then. 1. Check in Deco app if Satellite Deco Basement reports Ethernet backhaul, you should see it in Satellite Deco info page: 2. If it does, take Satellite...

@Henkan This helps, thanks. As far as Switch Office concerned, you have both Main Deco and Satelltie Deco (from the basement) connected to it. This is not going to work. See TP-Link FAQ: General...

@Kavan_Williams Archer axe5400 uses OneMesh and is not compatible with Deco mesh. See TP-Link Deco Mesh vs EasyMesh vs OneMesh vs Omada Mesh What's the Difference? This article also provides list of...