I bought a Yamaha P series digital piano few months ago. Recently I found out that there is a key, it functions normally but the touch is different from other keys. When I press it down slowly, I feel that key is heavier and feeling like something is stuck inside, but actually nothing is stuck in there, it is even a bit heavier than keys on the left side, does anyone know what the problem is? I cleaned my piano with wet cloth before, do you think that was the problem, but just 1 key.

Did you buy it New, with a warantee?? Yamaha is very good about servicing their stuff if you bought it through their channels