Recent purchased a 2015 TLX tech package by owner. He mentioned that the nav screen would sometimes go out due to the sun heating up the dash board or low battery life (but would turn back on after the car cools down). I left it out in the sun on a hot day and that's what happened when I turned it back on. The touch screen works fine but the nav screen goes from white to black and won't work, even if the car cools down. The battery life is fine as well. Anyone else experience this? Do I need a new nav screen or can the problem be fixed another way?