Hi, I brought PX-350 last December and i just realize some of my white key when i press down and release. I can hear a very obvious knocking sound. The sound was not from the speaker. It was from the keyboard inside. I also tried to check all the white keys and also the black key. Found out that almost all the white key had the knocking sound when i released. Some sounds soft and some sound very obvious. For the black keys all have no issue. Wanna find out from you all guy out there is this a digital piano defect or it is just normal. Because this is my 1st play digtal piano. Hope you all guys can give me advise on this issue. Thank you.
