My Imac keeps freezing then shutting down randomly

Pretty much everytime i turn my mac and try and do something straight away, it will stutter then just restart itself. If i leave it for like 5 minutes it is fine but then it will randomly just do the same stutter and then just turn itself off and back on again
Any help?
My mac isa mid 2011 IMAC
OS X Version 10.8.5
2.5ghz Intel Core i5
12 GB 1333 Mhz DDR3

Pretty much everytime i turn my mac and try and do something straight away, it will stutter then just restart itself. If i leave it for like 5 minutes it is fine but then it will randomly just do the same stutter and then just turn itself off and back on again
Any help?
My mac isa mid 2011 IMAC
OS X Version 10.8.5
2.5ghz Intel Core i5
12 GB 1333 Mhz DDR3

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