N900 and Ford Audio

With earlier versions of the OS I saw very few problems.
The N900 would connect to the Ford Audion system automatically (Even when the phone was locked)

Since I have upgraded to version 2.2009.51-1 the connection to the Ford Audio system is very problematic.

The N900 will not automatically connect to the Ford Audio system.
After manually establishing a connection to the Ford Audio system the N900 will disconnect from the is left for a period of time.
The N900 will disconnect immediately if the N900 is locked

This makes it impossible to use the N900 as a hands free device with the Ford Audio system.