I have a 17" unibody MacBook Pro. I have been noticing that the left side tends to make noise. If its sitting on my lap, just the small movement of setting my hand on the left wrist wrest or the keyboard tends to make a popping or creaking sound... I've noticed the metal also seems to flex on the bottom under the ports and the Express Card slot. Is this normal, it is rather annoying, I am wondering if my case has a defect or if its the design.