iMac crashes when rendering Adobe content

just quick question see if has out-of-the-ordinary suggestions issue have.

 

of numerous machines work with, 1 imac (late 2013) 27"

3.5ghz quad core intel i7

32gb ram (owc third party)

1tb ssd (apple factory-supplied)

nvidia geforce gtx 780m 4096mb

 

with substantial render, either in ae render queue or ame, system repeatedly (almost always) hangs , reboots few moments after render completes.  hang occur during render, it's upon completion.  have seen same issue occur when rendering ppro project ame, never directly ppro.

 

i running latest os x el capitan, , adobe apps date (although has been occurring on 12 months, isn't new thing, or version specific).

 

running identical software on other machines, , using same ae projects, have no problems.  past weekend did complete clean install of machine, bare software essentials installed, , problem still there.  i'm hardware issue imac.

 

my gut feeling either display card or ram issue.  perhaps process @ end of render purges ram causes it?  i'm supposing, of course.

 

i'd interested in educated opinions issue before drag box off repair shop.

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