I have three Deco M5 devices in the first floor of my house. The main Deco is on the wall behind the TV where the fiber modem is mounted. The second unit is about 7 feet away in a hallway. This on works fine. The third one is the issue. It is located about 33 feet away in direct line of sight to the main Deco but the TV is right in front of the main Deco. I can take a laptop connected to this node and run a speet test and only get about 100Mbps. Connections to the other nodes average around 500Mbps. Switching to access point mode helped some, it increased this node's performance from approximately 55Mbps to the current 100.

Is it the distance? or is it the fact that the Deco is behind the TV? Or something else maybe?

Thanks