This is normally caused by dirty or worn contacts.
Simply open up the keyboard and replace the contact rubbers when the sensitivity has been lost.
There are 4 different rubber contacts depending on which notes are not working
WJ231101 RUBBER CONTACT 16N-2M OCT 2M-55
WJ231200 RUBBER CONTACT 16N-2M OCT 2M-45
WJ231301 RUBBER CONTACT 16N-2M 76H 2M-45
WJ231401 RUBBER CONTACT 16N-2M 76L 2M-55
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