Problem with AME?

[Doug Gwyn, VLD/VMB]

I generally cut MY keyboard contact cleaner from a business card,
but otherwise what Moss said is what I would have said.

Keyboard contacts generally "bounce" (make-and-break repeatedly),
and there is a "debounce" circuit that waits a certain amount of
time until the oscillations should have died down.  A defective
contact can bounce more than the circuitry allows for.