x17 R1, screws popping off

There isn’t much to say. Once in a while—yes, once in a while—one of my laptop's fans starts rattling and making noises, only for me to find out that a tiny, tiny screw has popped off from somewhere... again. And after that... again. It's been three screws so far, and I'm just surprised at how a stationary laptop that always stays in place keeps spitting screws like clementine seeds into my fans. I would really like to know where they are coming from and WHY!?