I had to dig my old emails and when I had issues with my Rampage VI Extreme BIOS I contacted my local support and they then escalated it to the ASUS HQ. But at the same time, I reported the "bug form" here at ROG and got contacted by Raja who delivered me a beta UEFI to test and it fixed the issues...

So, maybe I will open a local ticket and see what happens. Then again my board is shipped from the USA and I do not know about warranty. My Intel 750 PCIe drive disappears every now and then even after replacing the drive via RMA while resetting the UEFI brings it alive again so it looks like a UEFI issue. This is actually the only problem along with the latest security fixes.