Hi all, Just upgraded to OS X Mavericks the other day. While I'm on my browser (firefox), my MacBookPro 15 inch keeps freezing up for a second and then restarts itself, showing a screen that says, "your computer was restarted because of a problem. Press a key or wait a few seconds to continue starting up." I've lost a few documents on Word, as well as online. Why does it do this? If it helps, I have the crash report and can paste it into this post.