I manage a few hundred Windows notebooks. Probably about half of them have issues hibernating. Despite the fact that they are identical systems, identical image, etc. I just tell everybody to shut it down before you put it in your bag. Otherwise we end up with overheated, melted laptops. It's always been this way in my experience. Windows is certainly better than it used to be at this, but I would be willing to believe that the hardware vendors aren't implementing things properly. I guess that's the downside of not controlling your hardware.