I have a 2011 Mac Pro, 6 Core (Pictures included) My problem is that it just shuts off randomly. We do a lot of video editing, SFX, etc. Sometimes it shuts off while opening Adobe Premiere. Sometimes it just shuts off when we arent doing anything. We took it in to a certified Apple Store (here in Spain) but they found nothing wrong. Continued smooth for a while but now we are getting the same problems.