My camera will be working fine then the touch screen will stop functioning and I cannot preview my images. I have tried turning the camera off and on, removing the lens (and adapter), and taking out the battery. Then the next time I go out to shoot everything works perfectly. I have had the contacts cleaned and bought a new EF adapter, but last night the problem occurred while using my RF lens. It's frustrating to not know if I will be able to change my focus point or see what I have shot.