Welcome to the forums, Mike.
 
Has there been any change with the memory in the system?  The first iteration of DDR3 memory that was intended for use with those boards had a higher voltage than what you'll see on current boards.  As in if you recently upgraded the memory and higher lower voltage units are in the system, that would explain the odd behavior.
 
Let us know what memory you're using and all of the settings you've changed in the BIOS, if any.