Yamaha YDP 144 (GHS action) key noise

[Kraks]

I bought this yamaha 4 months ago, and after 3 days, two black keys in the middle started doing noise when released back, but it didnt bother me that much since it wasnt too annoying. But now it became worse, and im asking, where is the problem? I pretty muchh cant return it because the shop is too far, and if i had to send it back to the shop i would have to wait 30 days and i dont have any other piano to practice.

 

[Kraks]

Here is how it sounded after 3 days (now sounds worse)

 

[b3maniac]

If you think that is a problem you should contact Yamaha for repair or replacement. Good luck, Don