Hardware Update #1: Corsair K55 RGB Gaming Keyboard.
The lower left corner of my Razer keyboard developed several sticking keys. It was used 2 years or more when I bought it. Ctrl has been uncooperative all along. It would stick up so much that I had to shove it down hard. First thought it was dirty, cleaned it, but stuck again really soon. The problem spread to everything from Tab to Alt and A & Z.