Things to try:
1) make sure the profile in your BIOS is set to "XMP" if available (this forces optimized memory/CPU settings.)
2) run MEMTEST ( www.memtest.org ) for at least two minutes (and for two hours later after problem solved)
If memory is fine after doing BOTH of the above:
1) reflash the SAME BIOS, then if that fails
2) flash the PREVIOUS BIOS in the list
*Update this post after the above and we'll take it from there.