My new 2016 MacBook Pro 15" with touch bar makes a metallic vibration sound when I tap firmly on the chassis. It even makes the sound sometimes when I am angrily typing. There's nothing moving about inside when I move the laptop from side to side. I made a short video of the sound here. Would any other 15" owners mind giving theirs a tap to see if the problem is common? I'm also getting quite poor battery life (4-5 hours) so it's getting replaced.