Was going to respond to your PM but through about sharing this for the community’s benefit. Having to change the direction / height / location of the hub to get it to work is a classic sign of mesh trouble. These devices are supposed to have omni directional antennas but most aren’t effective, because of which you have dead spots and all kinds of signal reflection/isolation issues.
Another likely issue is if there are any wires running close by through could be causing interference issues with the hub.
It’s best to keep the hub away from corners and other wires/devices. Especially WiFi Routers and laptops with USB 3.0 ports.
The optimal solution is to blanket cover the area with repeaters to form a strong and even mesh.