I love this router too, but have a strange thing going on.
Since the recent firmware update (6553) when I log into my UI all I can see when I click the Wireless tab is the 5GHz wifi, the 2.4GHz is missing. I posted on the ASUS forums and a fellow user (non-ASUS staff) suggested updating with a beta firmware, which I am reluctant to do.
The wifi is fine but I had adjusted the channels prior to the firmware update.
Any suggestions?
Rick.