Seems like a memory error, so run memtest.
Check the BIOS to make sure the X.M.P. is correct, or whatever settings you use that it is the correct voltage (default 1.5V for ram, might need up to 1.65V - try raising to 1.55-1.6V anyway, to see if that helps). Make sure all the timings are right.
If memtest turns up with errors, then you should RMA the set.
Good luck,
Ben.