Never heard that one before. But, ME firmware not matching the BIOS can cause NVME problems (sometimes causing a slot not to work at all). Just thought I'd also ask if your ME firmware matches your BIOS. Have a look on your support page and if you have the latest BIOS it will also say what firmware you should be on.
It's a longshot, but otherwise I'm thinking drivers or a strange BIOS config. What happens if you reset the BIOS to defaults?