What to do if your keyboard seems to duplicate keystrokes or a key stops working

[cal]

Yours is the second report of the N key spitting out phantom/duplicate keystrokes. Weird.

Phantom keystrokes

I have founnd that my keyboard occasionnally generates a seconnd n when typing n. I have tried repeatedly pressing the n key, and haven’t yet nonticed any sort of pattern to the generation of double n’s. No other keys seem to be affected. This post itself is an example of the effect – I have not corrected the double letters. Interestingly, it appears that the second nn can appear after the followinng typed character. Has anybody else observed similar behaviour?