I have noticed this as well.
I would have described it as a creaking. With my K3 it is right in the middle of the right hand side page forward button. It seems to me like the glue (?) holding the back on
has slightly lost its stick.
I've also noticed that it looks like the gut or what ever that keeps the screen and plastic surround is coming slightly loose at the right hand side page back button.
There is a miniscule gap that fine cat hair gets caught it some time! I can press it down again and it slowly lifts up again.
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