Computer freezes up completely

it just happens randomly that sometimes the system freezes up completely and the only out is to shut down from the power button i am not overclocked or anything and i cannot replicate the event i have ran memtest for 12 hours and it gave me 148 errors also i ran prime , linx and occt sometimes the errors happen and sometimes it doesn't

Memory: CORSAIR Vengeance 8GB (2 x 4GB) DDR3 1600 CL9 Dual Channel Memory Kit

PSU: CORSAIR Enthusiast Series TX650 V2 80 PLUS Bronze PSU

CPU: AMD FX-8150 AM3+ 3.6Ghz

MOBO: Gigabyte GA-970A-D3

Graphics Card: MSI Twin Frozr R7870 Hawk

OS: Windows 8 Pro 64 bit
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