Recently i bought a fuji x100t used in good shape. When i tried it , everything was ok. but suddenly, the camera as been autofucusing and closing the diaphragm without half pressing the shutter button. The green light in the back turns on and the camera acts like it's trying to focus. I've seen some videos that solves "aperture chatter" and seems that it's the same problem but since i'm not half pressing the shutter, it doesn't solve anything. Does anyone knows what could be?