I recently upgraded to the IP4. I can pair my phone successfully with my 2010 lacrosse to use handsfree, but there is a problem. WHen I go to make a call, the phone does not switch over the General Motors audio option. I have to manually select it. Sometimes it works, sometimes it doesn't. BUT, every time I get in the car, I have to manually select it. Is in car connectivity a known problem with the IP4?