It is possible that you got two bad boards in a row, but it is also possible the memory is slowly dying. I have seen inconsistent results like that before.
Since the board is two years out of support, you won't be able to swap it for another model. Sometimes you can do that in the first 30 days after purchase, but definitely not this long after.
If you have had the board less than three years, you can still apply for warranty replacement at Warranty Center . It shows:
Product:INTEL® WORKSTATION BOARD WX58BP, 10 PACK, OEM ONLY
Serial Number : BTBP1190009M
Stocking Id/Part Number : E64643-202
Estimated Warranty Expiration*: Feb 22,2015
so i think you might be okay.
I have checked my Power Supply and RAM and they are functioning properly on other boards. But I'm sure this is the board problem. I'm guessing this is the reason why Intel has discontinued this product. I use this board 24 hours a day and so I might (just might) probably be the longest user of this board and so I can see how it actually malfunctions after a period of time(1 and a half year approximately). I will give my board under warranty but this board is clearly faulty and Intel should do something about existing users of this board.
Thank You Dan_O