Having issues with Bluetooth and my car radio...

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http://forum.xda-developers.com – I was able to pair the Note 2 with no problem. The MP3s played ok through bluetooth. I could not hear Pandora and the hands free calling owuld not work. I then turned the car off and then back on and it started working. I then went inside for a while..came back out and it now doesnt work. It shows that the head unit is connected, but nothing but MP3 will work. I have an Alpine 133BT. My old Iphone 4 worked flawlessly. Anybodt having issues or know what it could be? (HowTos)