these are permanent hangs. nothing will work and no button response. after a couple of minutes i just have to take the battery out, wait half a minute and put it back. then i can start again. it start up perfectly without any problem. then i start putting a contact. that can work also good. after a couple i want to change one of the contacts, so tapping on it and when I'm at a line (field) what i wanna change and then it spontaneously hangs itself up. nothing works then, no button, no tapping, nothing.