i have the absolutely same problem, four days wifi working, and today at morning i found that no wifi wifi network detecting.
ASUS support have no idea, beside returning motherboard to shop.
UPD: OMG, i fixed problem without CMOS reset and system reinstall..
Delete wifi via System, and tick "Uninstall drivers" checkbox.
Download drivers for wifi from ASUS site, not using motherboard CD!
Not uising driver installer.
In System, searching for new devices and system will find wifi card and ask for drivers.
When system ask about driver, select folder with downloaded driver and system will complete setup.
....
PROFIT! 🙂
Now wifi working nice and i'm writing this update via this card without problem )
But i don't know how long it will working, but if it broken again, i need 5 minutes for solving problem.