I was carrying my new 15" from one room to another when I noticed a disconcerting noise coming from inside the computer. It is a light "crunching" noise with an occasional metallic "ping" that sounds as if a board is fractured or multiple components are rubbing together. It seems to happen with even the slightest pressure on the bottom of the computer towards the Macbook Pro logo (even when placing the computer on an open palm.) Has anyone else noticed anything like this?