I have a Mark III Nav System in my 2002 330xi. I know it's not an X5, but you guys have an awesome Nav forum! I'm running software 3-1/63, which is the latest code the Mark III will accept. I just got my car a few months ago and the Nav system has been running fine until this past week.

Lately, there have been several days where the temperature outside has climbed into the 90s. I've noticed the Nav computer will spontaneously shut itself down while I am driving. Sometimes it automatically ejects the Nav CD when this happens and sometimes it doesn't. It won't allow me to restart it if I turn the car on/off. If I reinsert the Nav CD, it doesn't see it. However, when I come back in the morning, all is well!

Does anyone have any insight on this issue? Do I just have a dead cooling fan, or is my Nav computer dying? My warranty expires in August 2006, so I'd like to get my car into the dealer if possible. Also, along that line, does anyone thing I'd be able to get them to upgrade me to a Mark IV?

Thanks!