I have a 2013 focus and my Lumia 920 is just terrible with my ford sync. Un reliable. While my friends with iPhones work perfectly. Its so ironic... I think it has something to do with the Bluetooth stack that Microsoft is using. It stutters for the first 10 minutes while playing music. The solution I have found is to pause for those 10 minutes and it fixes on its own. And everything plays normal. And of course there is the clutching when getting a call and resuming music afterwards.