I just bought a pre-owned 2013 Passat SE 2.5. I have my phone connected to Bluetooth. The problem I'm having is that when I try to listen to the radio (FM or SAT) it keeps switching back to BT-Audio all by itself and I have to keep pressing the FM or SAT button. Sometimes it happens by itself. Other times it happens when I press the home button on my iPhone or when I plug the charger into my phone. Please help!