Intel, please fix this board
The 3x revisions of the BIOS of the DZ68BC are problematic. BIOS 0028 was actually the last 'good' version. It is not possible however to downgrade from a 3x BIOS to 28. You check if downgrading to version 37 or 36 helps.
A lot of people on this forum are begging for a 'good' BIOS for the DZ68BC, but so far that doesn't seems to be a top priority.