I drive two different cars and my Passport connects perfectly to both of them. However, it doesn't disconnect automatically, I have to do it manually each time. If I forget and somebody then tries to call me, the phone doesn't ring. My previous Z10 didn't suffer from this problem. I have tried the usual things, ie turning the phone off and on again, deleting and then re-pairing the bluetooth connections, etc.
Hope somebody can help.
Thanks.