One thing that I noticed is that when I press some any of the non working keys (in my case D, O, 9,M, the keyboard doesn't turn on the light that is behind. I think that this could be an indicator of something going wrong inside the keyboard and not in tablet connector, but i'm not sure, I don't know how the keyboard sends the signal to turn the lights on.I have the exact same problem, no warranty available, what did you do? i'm trying to fix it by my self but I don't know where to begin. So frustrating!!