Nano clone center button weirdness
 

Over the past few months my center button ( Menu button ) sometimes would not work. It got progressively worse till I felt I had to upgrade the firmware or something. So I tried that and had to go through 30 or so firmwares till I found one fresh one that worked. However the button still does not work. I know it is not a mechanical problem since when I press it the dancing icons stop dancing sometimes. So it knows it is being pressed... any ideas