RBR 753 under MacOS Big Sur loses connection via app or online

[lmuellner]

Since I installed Big Sur, my Orbi RBR753 system functions well, but the app doesn't work, I can't login via orbilogin or by the router's IP address. If I restart the system, it works for a day or so, then I can no longer connect. 

[FURRYe38]

What OSX version did you have before? Catalina or Mojave? 

Cant you test a different Mac or iPhone? 

What Firmware version is currently loaded?