A little quick fix for the CRF Leica's, when you remove the battery cap look at the little ring around the threads. That is the ground connection. If it is dirty or "flat" and not sticking out it can be a problem. Not working or intermittent. Clean the outside edge with a pencil eraser or 600 grit sandpaper and carefully bend it back out so there is some tension. Things will then be good to go again. Only issue I have seen with the Leica CRF series.
