N key doesn't work as expected

Hi everyone. My device is MacPro 2017 with touch bar. Its 'N' key didn't work well after a month from the time I purchased it. Then I sent it to Genius Bar to repair it and spent about half a month to resolve this problem(ps: really a long time. I need laptop everyday!). But today I found the same question for the second time after last repair!! When I prepared to order a call from the apple support center, 'N' key recovered by itself. It is really a strange issue which I think may be a common design flaw.

Have you guys ever met this terrible&annoying problem? I really want to know whether it is just an instance of my poor device.

Thanks for your reply!