Just curious. Poked around a bit and didn't see this particular failure discussed (as opposed to the "clicks but didn't register" problem).
On mine (about a month old) I'll sporadically get two "divide" inputs for one press of the divide key. Happens about one in 15 times on average.
Calling HP tomorrow to see if I can get a replacement.
(I seem to be facing down a general technology revolt - everything from my valve cover gaskets to computer RAM decided to pack up at once!)
Bob