I noticed a few times that has happened to me that the vol icon was for voice and not a music note. you can see it in the hud when you press vol +/- . double press the voice button and it seemed to have fixed it.
it might help others to know more about your situation, there's no phone details for example. or if you've tried wired connection, etc. your phone can have a lot to do with this type of issue.
it might help others to know more about your situation, there's no phone details for example. or if you've tried wired connection, etc. your phone can have a lot to do with this type of issue.