ariescrown

Can someone help me. Today for the first time when I started the car I heard the radio on. The Nav. screen stayed on the closed mode awaiting the pressing of I agree. I have always had to put the radio ON after the starting of the car. Also when I put the radio on another screen came onto the screen. Now the closed screen stays on. Only when I manually change stations it shows the station numbers at the top of the screen. A year ago my Nav. screen went out. Lexus of Greenwich Ct. mistook the problem as the Nav. power board / pack on the trunk floor. My warranty co. would not put in a lexus part and Greenwich sent in a perfectly good lexus part and replaced it with an after market part. When lexus found out that was not the problem they then put in a new lexus Nav. screen. Everything has been back to normal until today. Anyone have any ideas. Thanks to all.