Mine makes a tick or click sound if I push the middle or bottom of the door with my finger toward the display screen. It is very quiet and it does not happen when I am holding it even with a 600 F4. If I try to push the door with the meaty part of my thumb muscle while holding the camera (trying to push the door closed towards the display screen at the bottom on purpose, but not a natural hand position), I can sometimes make this sound. I do have fat/strong hands. If they were skinny, I might not be able to force it to make this sound. While I was writing this I played with the camera trying to make it creak. If I use the meaty part of my thumb muscle and grip the camera hard and try to push the door to the front of the camera (the last motion of sliding the door closed), I can make it creak. So yes, if I use enough force trying to force it to make a creaking noise, I can do it. But it does not happen when I am shooting normally even with a heavy lens.