Play in Db. Sorry. I couldn't help it.
I had a similar problem with an Ensoniq keyboard . As mentioned above,it's most likely a worn contact . I didn't fix mine myself but gave the keyboard to a friend for his son. He took it apart and replaced all the rubber contacts and it was fine. He was a member of my motorcycle club and was great working on bikes so I'm guessing it's a basic fix and doesn't require any electronic knowledge. Good luck.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer