I have two issues related to the aux input in my car that I didn't have with my DX

1 - the music app immediately starts. I have tried searching through all the settings but I can't get it to stop.

2 - when a call comes in, the caller hears a terrible echo and while the call comes through the car speakers the caller is all broken up and choppy. Both of these issues go away if I unplug and use the speakerphone. On this one, I think all the S3 microphones are picking up both my voice and the caller's but I can't get it to work.

Any ideas? Thanks