I hope the LX100 qualifies as a M43 camera. I have this strange problem with my LX100. Very often when I switch it on after not using it for a while it will not focus in any mode. The manual focusing enlargement box shows me the camera is out of focus at any distance when I switch it to manual and try to focus on things. Switching the camera on and off a few times seems to cure the problem as the camera then focuses perfectly both in auto and in manual. I can switch it on and off and the problem does not manifest itself. I am puzzled.