I have a 2016 macbook air that I bought 2 years ago and I've had some problems with it, but it was an easy fix. Now, some keys don't work on my keyboard sometimes. I could press it on it multiple times and it would take a few seconds before they finally respond. The keys that don't work is delete, A, and 1. I'm not sure if there's any other keys don't work, but theses are the ones that I've noticed so far.