Slight flex and metal noise near macbook pro logo on 15" retina

[vbman213]

Was cleaning my new machine earlier and noticed that the bottom case seems to flex ever so slightly underneath the macbook pro logo on the bottom case. Sometimes it makes a metallic almost glassy noise similar. I know there are pogo pins on the board but is this relatively normal?

 

[B...]

Some people have attributed this to loose bottom screws. Try tightening the bottom case with a pentalobe screwdriver.