Since I installed High Sierra I sometimes have to double tap Command + Space to open spotlight search bar. This problem is weird because it happens randomly. Say I just double tapped Command + Space, it won't happen again for a couple minutes.
I haven't setup any shortcut nor I use any app that steals this shortcut. I have no idea what is going on and it is really boring, cause sometimes I'm in a text editor, tap Command + Space, nothing happens but as I'm used to it, I start type right away and mess up my code.