Even though mechanical keyboards are long-lasting and their keys rarely stick due to their smart switches, external factors can sometimes cause some sticky keys on your keyboard, which is not very common but can occasionally occur. It is especially possible if you do not pay much attention to the things around your beloved mechanical keyboard. There are several reasons why a key can become stuck on a keyboard. Even fixing sticky keys on its own can be a major task. You can check your mechanical keyboard keys here. The spacebar test is the best way to determine whether your keys are working correctly.