Imac Keeps Shutting Down during use and needs to be reset


just stated have problem 2013ish imac 27in. during use shuts right off. ill day out of using shuts down. after shuts down, have unplug restart it. after restart might few minutes of use before happens again.
apple ran bunch of test on phone , reinstalled operating system , still didn't work.
brought apple store, had week , not duplicate problem. after getting used few days , happened again, luck. nothing plugged computer, suggestions appreciated. last year hard drive failed on computer , had replace well.
 

do have kind of power conditioner on ac line going imac such ups (uninterruptible power supply) or surge suppressor? might experiencing power line issues causing problems in imac. might check line voltage plug imac in power verify not low ... or high.
 


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