I updated the firmware today, but have been having some problems.
After the update I first looked at the log to see if the flood of messages was resolved. It seems it was.
I then selected the Network Map and the system hung. I was not getting any response from the router either on the PC (wired connection) or the Asus router app on my Android phone. I unplugged the router and restarted it, but it still failed. I could get to the log in screen, but once I logged in it stopped responding. During this issue the router was still working for all connected devices... it was only the web interface to the router configuration that was problematic.
I did another power down and up again. This time, using the browser history I went immediately to a different page on the router (e.g. Admin) at which time it first ran me through the log in and then got to the right page. All seemed well after that.
Later though, I went into the router to make a change on one of my guest networks. It seems that in many cases I could Apply a change, I would see the percentage indicator complete, but then the router would stop responding. Looking at the lights it seems that router was restarting itself so I'm suspecting the firmware may be crashing.
I have also noticed what I think may be different behavior from before. I use MAC filtering for everything and I also use manual IP assignments for all my devices in the 192.168.1.1xx range. Now when I look at the client list, those items on the guest networks no longer use the manual IP assignments but rather DHCP in the 192.168.101.xxx range for the 2.4GHz guest network and 192.168.102.xxx for the 5GHz range. I don;t ever recall seeing it that way before.
Also I have a DISH Hopper that connects to the 5GHz guest network. Now both the Hopper and Joey devices show up in the client list as Wired, not wireless.
I'm thinking I should revert back, but not sure how to safely do so. Or, just not change the config and hope a fixed version is released soon.