Here is the email I just got from Pioneer...
September 14, 2007
Dear Valued Customer
Re: Free Firmware Update for Pioneer AVIC-Z1 & AVIC-Z2 to Address Lock-up/Freezing Issue
We would like to inform you of the availability of a free firmware update for the AVIC-Z1 and AVIC-Z2 to address a potential lock-up/freezing issue. Pioneer has become aware that a small percentage of AVIC-Z1 and AVIC-Z2 systems, especially in very hot temperatures, lock-up or freeze when powered on, such that the systems do not proceed further than the initial boot up screen.
If you are not exp