Comment by themaninthedark

Not sure which version of the entertainment system you have but on my 2016 Mazda 3, it will try and play the last song you had playing on your phone. If it can't get the song to play it will then default to the other last audio device i.e. radio, XM, CD.

You should have separate volumes for music, navigation and hands-free in the entertainment system. Also, you can mute the sound using the volume knob while the warning text is displayed during key on.

My current solution is to make sure my CD player is the other last used device so that if the BT connection fails, I get sweet sweet Baroque music instead of FM blaring.