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Message: <blockquote data-quote="pigoo3" data-source="post: 1661194" data-attributes="member: 56379">Yes…this sort of "random issue" situation does make troubleshooting much more difficult.  And guess what??…take the computer to Apple…and they may not be able to duplicate the issue either (not knowing exactly what the issue is).The only other thing I can suggest is.  All electronics do not like heat.  Maybe you can download & install a temperature monitoring app….and an app. that also monitors fan speed (many times the same app will do this).Then be "OCD" about watching the iMac's temps & fan rpm's.  Being VERY aware of what you're doing…and what apps are open..and the relative changes in the iMac's temps & fan speeds.  You may find a relationship (such as higher temps accompanied with high or low fans speeds) that trigger the issue.- Nick</blockquote>