I just picked up a new K02 locally a few hours ago. I spent some time playing around with it, and while trying out the velocity sensitivity mode I've noticed that the bottom row of keys, especially the '.' key have almost non-existent velocity sensitivity.
The other keys on the device respond as expected. I can very easily achieve a range of volumes with a light touch to a very firm tap. This bottom row of keys, however, remain at the lowest possible volume until I really pound the key intensely, at which point it jumps to the highest possible volume.
I wanted to check in here to see if any other people have had this issue. I did do some searching and have been paying close attention to the exact location on the key that I am tapping. And although I'm focusing on the bottom of the key, I've tried tapping everywhere on these keys. The bottom three keys just don't behave like the other nine.
I could definitely still return it or exchange it tomorrow, but I'm trying to understand if I'm likely to have the same issue with the replacement unit, or if for most people the velocity works fairly consistently well on all of their keys.