About a month ago I started having trouble with a repeating key, specifically the 'n' key. It would randomly repeat itself while typing. As many others have reported, this is only fixable by replacing the entire top case of the MacBook. Well, my limited warranty was expired ¯\_(ツ)_/¯, so I made this tiny app instead: https://github.com/johanbaath/keyblock It will block unintended duplicate keypresses for all the keys you specify in a configuration file. You will need to compile it yourself as I have yet to publish a pre-compiled binary. Let me know if it helps you too!