[Q] Issue carkit Audi Q7

Hello,

We have an Audi Q7 with Samsung Galaxy S3 problem.
Bluetooth connects,
Outgoing calls are OK
Incoming calls are OK when I pick up the phone with touch screen it works too
But when I pick up phone with buttons of car, FM Radio keeps on playing, if this happens and I click on Disable/Enable headset on touchscreen of phone it works.

Any ideas how to fix? I have already tried installing Criskelo rom, and all updates but that doesn't help. (I must say it worked once!) after upgrading to Criskelo. But since then, it never worked again. Stock rom wasnt good too.

I hope someone can help me out.

Regards,

HD Services