RBR850 - no access to interface

Not yet.  I'm going to sit on it for a while (as long as everything else is working) and see if it comes back on its own.  If I have a problem, I'll shut off the power and boot it back up to see if that restores connectivity.

I've been using this RBK753 for almost half a year now and I'm impressed with the range, and with the speeds at the edges of the range (I have to use it daisy-chained because of the layout of our house) but there are annoying things like this, and like a few 2.4ghz devices losing connectivity or running into DNS problems (which has let me to try the CTS setting adjustment), which give me pause as to whether to recommend it to anyone else.  I don't seem to have problems with "major" devices such as the Macs, the PC, Roku, TiVo, the iPads or the like, but devices such as the Honeywell thermostat, the Hunter irrigation controller, the Ring security camera, one or two smart speakers -- those drop connectivity too often and restore it only after a reboot of the RBR.  (I've already disabled AX on the 2.4ghz band.)  This latest issue -- being unable to access the interface either through the app or through a browser -- just seems to have popped up out of the blue and is another annoyance. We'll see if it grows into a problem.