I am running in Aperture priority mode, with the Control Ring set to default (so it controls the aperture setting). Quite often, after taking a number of shots and then moving the camera onto my hip, the aperture will change. I carry the camera with a strap going across my torso. I do not know if this may be due to the Control Ring moving, and wonder if anyone else has experienced this problem. Fuji tech support stated that to fix the problem I would have to send the camera to NJ. They would have to replace the entire lens and sensor assembly, to the tune of circa $225 including shipping.