I think some people have said that the 200a focus ring behaves more like the 170's. The 200's focus ring works perfectly fine in cold temps, the 170 and supposedly the 200a exhibit this focus ring stick.
SO basically if you shoot in moderately cold to very cold environments, the current sleuth of Panasonic might not be up to the task. Walk backwards away from the camera, take a couple of gentle steps, turn around and run!