Hi I have a newbie question wonder if anyone can help? I bought an used GH1 and the problem I'm having is when mounted the 14140 lens, the lens is not 100% secure. When I turn the zoom ring on the lens, the lens itself rotates from the body just a little bit. The same thing happens with the pancake also. Is this a defect, does Panasonic service something like this? it's quite annoying. Thanks.