I have just faced the same problem. Keyboard and trackpad of my MacBook Pro 13” Early 2015, do not respond now it all. The problem started after I installed macOS High Sierra before 2 weeks. Everything was working fine before that. For the past 2 weeks whenever such thing was happening I was just shutting it down and turning it on again and was working. Now this option is not working too. I am just wandering what has happened as I was taking good care of my system. I hope the issue can get resolved.