I am battling to get AFC working on my Panasonic GX7. I'm in aperture priority mode using the Panasonic 14-42mm lens. AF-Mode is set to one area with the focus block set to as small as possible. Autofocus is set to AFC and it does show AFC at the top of the screen. I then hold down the shutter button to focus. It beeps, the focus block goes green and at the top of the screen AFC changes to AFS. I can then move the camera but focus is locked until I release and press the shutter again. I have even reset everything to the factory default settings in case I had changed something that prevented it from working. Is there anything I am doing wrong?