I would test your Power supply before getting a new mother board, OCCT has a decent test for it
You have a decent psu but even the greats are not with out fail every now and again, I haven't used the OCCT PSU test much so I can not give too much advise on it, but the problem you are having...
I would stay away from Foxconn products until we all find out if they are truly closing the Channel division (retail motherboards, FlamingBlade, Bloodrage ect.) If there wasn't a million rumors of them closing down then I would get a Bloodrage as well.
I am having the same issue with my Q9550 and Abit IX38 quadgt motherboard. I am told it is because the motherboard doesn't support my cpu, even though I have latest bios. But abit mobo division is dead so I have no recourse, unless you all have some tricks up your sleeves???