Well, I have finally come to the conclusion that the occasional core shutdown is just silly and brought my MacBook Air (first week 1.8 SSD) in to the Genius Bar. He ran a couple of tests and just said, "let's send it in and they will probably just replace the logic board". I will be anxious to see if this fixes the problem. Will they by definition deal with the thermal paste issue in this operation? Has anyone else been through this drill? I am curious if things were resolved afterwards and if there is less fan useage. I don't mind the fans coming on as much (I probably wouldn't have paid much attention expect for reading this forum), but core shutdown after an hour of video is unacceptable and clearly a "broken" machine and not a limitation of the specs of this product.