I’m not feeling well today so I will have to leave it to others to go into details on this topic, but that close to the hub plus the lag my first suspicion would be WiFi interference. Where is your WiFi router relative to the hub?
Also, if you haven’t read the range FAQ yet, start with this:
A Guide to Wireless Range & Repeaters - #11 by JDRoberts
(Edge may be a factor in all this as well, in that it might be less resilient to message transmission failures. I don’t recall seeing anything about how device health works with Edge. So maybe multiple factors.)