I just got a GX8, it was off ebay and although it's described as used I don't think it's very old as it looks to be in perfect as new condition. However there was one thing that is a little odd - the sound of the mechanical shutter seems a bit strange compared to the G7, I can only describe it as whirry / wheezy. I just wanted to check it's normal and not a sign of any problem with it... also I'm curious as to what the whirring actually is - it's obviously some small motor or other within it. When I do a long exposure, it makes a little whirr when the shutter opens - then when the shutter closes it just clicks, then after the long shutter NR is finished, it has another little whirr. So what actually is this little whirr noise doing?