I had the most bizarre issue with my 2017 MacBook Pro keyboard: the left shift key stopped working intermittently. Thinking it was a piece of dust, I took off

I had the most bizarre issue with my 2017 MacBook Pro keyboard: the left shift key stopped working intermittently. Thinking it was a piece of dust, I took off the key cover and tried to clean it out. Nothing worked. I finally made a Genius appointment for the day after High Sierra was released. I updated to High Sierra that morning and, suddenly, my shift key was in perfect working order again.