Yes I am noticing the exact same thing with mine. This seems to be a thing with Casio key beds over the years.
I don't know if this would work for the s3000, but here is a video of a DIY repair of this issue with a PX3:
Repair Vid
https://www.youtube.com/watch?v=v3phzrzVfQw&list=WL&index=24&t=0s