I have a F90BT with rear camera installed in my Smart car. One day, the rear camera is not working, when in reverse gear, the F90BT screen will show the normal menu, map....., the F90BT unite is function completely normal. but no reverse camera picture. When the gear in the neutral and foward gear, the screen is a blur out of focus light up, I can no longer get into the menu or map or any other functions. Is all these due to faulty camera or something else?