Bluetooth connection between iPhone 4 and Mercedes Benz APS 50

Question

I have massive problems to use my iPhone 4 (OS 4.1) together with my brand new car from Mercedes Benz. It is a E class Cabriolet 200 CGI from 2010 with a APS 50 Radio/Navigation/Telephone System. It has bluetooth included and I can connect my iPhone 4 to the APS 50 and even import all my contacts. But every time a start an outgoing phonecall through the APS 50, the connection seems to collapse. My iphone is dialing, but the APS system disconnects bluetooth coupling after some seconds. I even don't hear a dialing tone throzugh the speakers.
Fortunately my wive has an iPhone 3GS (my old one ;-)) with iOS 3.x - and it works perfectly. So it must be something with the "4". A call to AppleCare did not help, they do not know the problem. Mercdes says, it is an Apple problem!
Can anybody help?

Answer 1

Have a similar problem with the COMAND system in my 2010 C class Mercedes. Bluetooth worked fine until I upgraded my iphone 3gs with 4.1 software. Now it frequently shows it to be disconnecting and reconnecting on the screen even though I always stay connected when on a call. It really is distracting when driving when the message constantly goes on and off the screen and also obstructs the satnav screen when in use. I called in my local Apple store but they were unable to assist and I have returned the car to Mercedes who have installed the latest software updates to the COMAND system. I have also re-paired the phone but still the problem continues. If only I could downgrade the iphone software to the previous version that worked perfectly. This whole episode is fast destroying my faith in Apple products.