I'm troubleshooting an issue with my Deco mesh WiFi system in Access Point mode. My setup is:

Modem → Router → Switch → Main Deco and 3rd Deco (both wired to switch)

My 2nd Deco is positioned between these two and has no wired connection (wireless backhaul only).

The problem: Despite my 3rd Deco being wired directly to the switch, it seems to be ignoring the ethernet connection for data backhaul. Internet speeds around this 3rd unit are surprisingly slow - performing as if it's using wireless backhaul instead of the wired connection I've provided.

Has anyone experienced this issue where a wired Deco unit doesn't properly utilize its ethernet connection in Access Point mode? Any troubleshooting steps to force it to use the wired backhaul instead of wireless?