My avic z140bh had been working for about 6 months no problem then all of a sudden I get off from work and the headunit stops responding to touch and all the buttons loses its function ( for example when I click home or mode it doesnt go to home menu or to the map it just skips the rrack or pauses the track or on radio seeks the next station) does anyone know whats wrong I tried pulling the power harness on it and still same thing whenit boots up