Jim,

If it's just one key, it's probably your contacts (a little dirt under one of them).

They work on contact (time it takes for first contact to hit) and velocity (time between first and 2nd contact closing the circuit).

When you open up, us a dry cloth with very little alcohol to clean both the surface of the FATAR circuit board and the actual contacts themselves. While you are in there, you might as well clean the entire circuit board too.

That should do it.

Thanks,

AJ