ASUS Prime x399-a with a Threadripper 2950x and 128 GB of 2666 RAM. NVMe M.2 boot drive and 2 TB SATA SSD for data. With an untouched BIOS, everything boots up fine. Windows installs and runs just fine. Either set the tuner to DOCP or the memory popup menu to Profile #1 (why does it have such a generic name?), reboot and it boots back into the bios. This happened a few times until I noticed that m.2 drive has gone MIA in the BIOS. Reset it to the defaults and M.2 drive reappears and everything is as it was. So it seems that altering the memory profile makes the M.2 drive disappear. What's causing this?