adtranz

Hi, I recently purchased a vehicle with a Pioneer AVIC-900BT installed and what I am finding is that the unit sometimes will not load up correctly and the screen stays blank but the radio/cd will still operate and play music but nothing on screen so really frustrating. This tends to happen daily if I do short journeys etc. I wondered if anyone else has had this issue or have I just got the settings wrong somewhere? I did look at the system settings and it says: MAP V 01.000 800 1.900000 and after looking into this it it appears it has the original firmware installed so I went on the Pion