You could try slowly updating your BIOS from your current version to the latest to see if it helps. I've never seen that happen, but you do have a ton of BIOS updates available, so it's possible something changed in their update procedure on one of the later BIOS versions. You can try updating to 1.9, which seems to have an updated M-Flash module (interesting!).
If that doesn't work, try updating to 1.6, then 1.7, then 1.8, etc.