In an article in the Wall Street Journal, Apple has apologized for the “small number” of users who are experiencing issues with their third-generation butterfly keyboard. The latest generation of the ultra-thin keyboard is on the new MacBook Air as well as the 2018 MacBook Pro lineup. It sports a membrane to prevent key sticking and non-responsive keys as well as keeping dust and dirt out of the mechanism. Apple indicated this would solve the keyboard issues that plagued the first and second generation keyboards. That appears to not fully be the case.
We are aware that a small number of users are having issues with their third-generation butterfly keyboard and for that we are sorry. The vast majority of Mac notebook customers are having a positive experience with the new keyboard.Apple via The Wall Street Journal
As it stands right now, the first and second generation keyboards can be repaired free-of-charge by Apple through a program initiated by Apple. This program covers the 2015-2017 MacBook as well as the 2016-2017 MacBook Pro models. The new-for-2018 MacBook Air and MacBook Pro are not covered – at least not yet. If there are enough people who have experienced issues with the third generation keyboard, they could expand the program to help those customers too.
If you have an issue with the butterfly keyboard on your MacBook, contact Apple Support to get direction and assistance.