Hello,
I had exactly the same issue as the original post by HappyRogue658, then I noticed that GIGABYTE has released an new BIOS update (F21) with the following notes :
https://www.gigabyte.com/Motherboard/Z690-AORUS-ELITE-AX-rev-1x/support#support-dl-bios
Checksum : 20BF
Improve DDR5 5600...