[fabio984]

Last month I found my new Macbook Pro 2015 rattling.

Took it to Apple Store and they changed the LCD Frame and the problem gone.
Last week it started rattling again, I took it to Apple again and they said a lot of Macbook have this problem, almost 1 week passed and they said they're waiting for an answer from Apple. The store told me this sound came from one key?!

Today I found a video showing exactly my problem. Does anyone here had this issue?

[robertk328]

Banging it on the table probably did it.

I have two but won't be rattling them at all because I don't want to know if mine do it! They have to be able to open it and see what's moving in there. Bet it's something that is glued that came loose from heat. The back of the  Watch has been known to sometimes get loose and disconnect during/after charging when the watch gets warm. Doesn't happen to all (mine hasn't in 1-1/2 years) but does indeed happen.

[fabio984]

Banging it, no. Almost all the MacBook Pro have this issue... and I listened it rattling while sitting in bed.