Is there a common issue with the 13" unibody macbook running hot? I have had this machine for about a year now, at first it was fine, but then a couple of months after I had it, it started getting very hot. It is especially noticeable when watching videos where it becomes too hot to keep on my lap. If, for instance I am watching a video on youtube, the heat gets even greater and I can hear the fan working overtime and it gets louder and louder until the video is stopped. The heat comes from underneath the top left corner (under the esc key). Common issue, or should I get in touch with Apple?