RBR50 with Firmware 2.5.1.8

Well, once again, "I got nothin" (except that it reinforces my position to wait until January to consider updating firmware from 2.3.5.30).

Maybe you could consider the process of a factory reset and setup from scratch a form of meditation?  Spend an hour or so typing things into the Orbi LAN setup and device naming screens, checking each one off a master list until "Done".

A hint:  I found that a new setup worked best for me when I initially left the Orbi name at the factory default, rather than changing it to match my previous setup.  That way, none of my devices would attach to the Orbi before I had made all the IP assignments and was ready for them.  After the DHCP definitions and LAN setup, then I would go back and change the SSID so that everything could attach.

Give it a bit, My worked fine too for a bit, then devices started not showing up.

I got a IP CAM, Ring style doorbell, a MS surface, a UPS, iPhone that don't show up in connected devices.

Everything worked fine, just hard to set static IP's when it looks as if it's not connected, but you kjnow it is...