shutter button stays 'half pressed'

The shutter button of my rx100 iii has some kind of loose contact (or better: the opposite of this). Sometimes when I press it and let it go again the frame on the display that shows if the pic would be sharp remains green. And as the camera ‘thinks’ I’m still pressing the button half way, all other buttons and functions are blocked. I can usually unblock it by tapping several times on the button. Can I fix this somehow?