i have a 2008 WRX that i just bought. LOVE IT. however at night when i first start up the car the nav turns on but after a few minutes the screen goes black and i cant get it back.I have to turn off the car to get it back. I live in CT and its been cold. the only thing i can think is the crystals in the LCD screen aren't warm yet and turns off. It only happens about one in 5 times at night and if i drive the car for a while it's fine. Any suggestions?