Hi, I have a 4 week old GH4 purchased in Canada that has started to "squeak" occasionally when turning on the camera. I have isolated it to the sensor cleaning process - that is if I initiate the Sensor Cleaning in the menus I can reproduce this noise. However, I wanted to ask any of you GH4 owners out there what sound your camera makes when running the sensor cleaning process? Is it completely silent (which my GX7 is)? Or does it makes some high pitched noises? Thanks.