I also had this problem with my Asus Maximus VI Formula motherboard. I needed to update the BIOS from ASUS. I have a custom built PC so I don't know if you get it any different.
Go to the motherboard you own on the ASUS product website.
Go to the support tab then select Driver and tools, then select your OS and then look under BIOS. Download the latest for your motherboard.
You could also try EZ update app from ASUS, but I found it wasn't letting me know that there were updates as I found it myself, your better off trying to download it yourself. I found EZ update to be useless.
Updating the BIOS fixed that issue for me, my current BIOS version for my motherboard is 1402.
Good Luck.