Asus RT-AC66U GUI Menu Problem

In trying to access the web GUI menu for my router, I keep running into an issue that, while I can log in, the menu is only partially displayed, as if it is a zoomed in version of the lower third. No ability to scroll up. I have tried on multiple browsers, including my iPhone with the same results. I am hesitant to do a full reset, as it is functioning, however, I do want to be able to access the router menu to change settings and update the firmware, etc.

Any ideas? An hour of web searches have shown that this is not an uncommon issue, but what I found was unhelpful in resolving the issue and often a few years old.

EDIT: Problem solved. Apparently, Sonos was the issue. I found a Tom's Hardware post from 2015 that suggested that. Stupid weird computer stuff.