After my romance with my Nord Lead 2X (I'm freaking in love that machine <3), today I got a beautiful Nord Wave in pristine condition at a great price... or that is what I thought.
Most of the buttons, maybe half of the total, are behaving strange. Wen, i.e.,I try to change preset with the page buttons, I push the page up button, and the thing just ignore my command, change the preset as I expected, or just skip one or more presets. One of the weirdest behaviours, it's the mod envelope routing button, that sometimes, instead of cycle clockwise, make an step backwards

The OS is the 2.14. Can be a bug? As I said, the machine it's in mint condition. The knobs feel tight, and button feel are just right, nothing loose or any strange noise. Not any sign of abuse, not even a minimal scratch.
Any idea? I'm really liking this machine as his older brother, but this is driving me nuts.

Thank you all!