This one is weird and has me stumped. The letter keys on my keyboard will seemingly stop responding after a while. I'm not sure exactly when it happens or if anything triggers it. Most other keys seem to work ok, like the Windows key. But I did notice I can still use things like Ctrl+V or Ctrl+S so they are working to some extent. They just won't type anything. I swapped the keyboard after it happened and the same thing. I tried different drivers and reinstalling drivers and nothing worked. I have to restart my computer to get it working again. I thought a simple driver re-install was all I needed but I have no idea what it's doing. Any ideas?