As the title says, whenever I repeat the ⌘ key it triggers a copy command (just as if I pressed ⌘C). I can even see the "Edit" menu entry blinking when I do that. This happens system-wide.
I checked OS X's shortcuts under System Preferences > Keyboard > Shortcuts, but there's nothing there. I also checked other apps, like BetterTouchTool, but it's not defined in any of them.
This started happening a couple of months ago and I'm going a bit crazy with this. Is there any way I can know which app is creating / assigning each shortcut? That could massively help narrowing it down.