I had the exact same problem with mine. After a while the system decides to not work completely (instead of freezing up after 10-15 minutes). Just recently the screen has started to pop up every time the car is started up... with an error message in japanese.. i think it is somthing along the lines of "please contact the program desk"
I'm completely bummed about it.. to it to a car stereo guy over here in WA and he was completely clueless.
Is there definitely nothing that can be done?
Does anyone have any suggestions as to what other system can be put in so the i can keep the motorised pop up screen?
