Orbi firmware update v2.1.4.16 availability

Baseman70, good to see you are trying to resolve the problem.  

My experience is that pre Orbi, my Billion modem/router with WiFi functioning was not up to penetrating my inner plaster walls with any great quality, and nor is my Orbi router, so at the end of the house where the Orbi router is located, connectivity is fine, but signal strength is a bit weak, but my wired satellite in an open plan area 10 meters away from the router, is fantastic.  The satellite’s reach is phenomenal - up to 15 meters to a LIFX globe in the garden, at 100% signal strength.  This is why I praise my Orbis.  

Now to your problem, FURRYe38 is on the money with his suggestion of running new Ethernet, but if that’s not possible, you can try a powerline adapter. Here’s some information on that.  Some power line adapters may create interference, but it may be a way to see if there’s sufficient enough improvement to justify the running of cat6 cable.  That’s what I have done, which I think contributes to my successful outcome.  Re powerline adapters, I have a Netcomm power adapter with a bypass power outlet delivering a network point to an out of the way place that’s used occasionally, and it works without any issues I can detect.  My two adapters have 3 status lights that alert me to connectivity issues, which are always green.  

Good luck