We took our first road trip this weekend with the Model S, and it was fantastic. We did experience one minor hiccup. While cruising along listening to Slacker, my wife decided to do an internet search on her iPhone. As soon as she started, the radio paused and her iPhone appeared on the right side of the speedometer display as if she was making a call. I tried to end the call with the right scroll wheel to no avail. She finally had to turn off Bluetooth on her iPhone to release the radio and continue the internet search on here iPhone. What caused it and how do you fix it, short of turning off Bluetooth?