I've had the car for a month and have spent a bit of time trying to learn how to use its technology. Have done pretty good, but there is one area that just doesn't seem to be operating quite right. I have the car's sound set to Navigation Priority, which states that while navigation is vocalizing, the radio's volume (all system's voulume should be decreased) should be decreased. Well, although radio volume during BT phone use is actually off, there is no change in radio volume when navigation is talking??? So, let me ask: Am I correct/incorrect that radio volume should decrease during nav. If correct, then is just my setting of Navigation Priority enough, or is something missing? Thanks.