Asus X870E Crosshair Hero Dropping 1/2 Memory.

Hi,

I recently bought this board brand new from Newegg and every so often when I restart the PC, it goes to Q Code 15 and then only 32GB of my 64GB are shown. I'm using G-Skill modules and they are on the QVL.

Sometimes I get stuck on 0d Q-Code and have to do a hard reset.

My PSU is Corsair 1200W

CPU 9950X

GPU 4090

I have no heat issues and I don't overclock except for EXPO and PBO -15 All cores.

Any ideas? Do I have a defective board?

It has never crashed when I'm using it. BIOS is 1104.