Several keys now make loud noise!

[Chrisk-K]

I bought a Stage one month ago. Now several black keys make loud ticking or clicking noise as they retun (after I pressed them). It sounds like they are hitting the adjacent white keys because when I press those white keys and then press the offening black key, it doesn't make noise as it returns.

Does anyone have this problem? Since all the keys were quiet when I first bought my Juno Stage, I'm worried that the noise will get only worse.