Hi, New owner of a Surface Pro 2, and I noticed today that as I'm taking notes with the pen, the screen sags slightly downward beneath the weight of my hand. Is this normal? I don't think I'm pressing harder than I should, but I guess I could try to train myself to rest my hand lighter on the surface (of the Surface, lol). Also, I have one of the Surface Pros where you can press on the upper left corner and feel the case give. I found other reports of this in various forums, so I assumed it's nothing to worry about. Thanks.