In my new car it works most of the time, but sometimes when I press the "Siri" button on my steering wheel, Siri will respond through the car's speakers. Then I

In my new car it works most of the time, but sometimes when I press the "Siri" button on my steering wheel, Siri will respond through the car's speakers. Then I'll ask her to play a song or navigate somewhere, and the audio starts playing out of my phone's speaker. Fixing it requires going through the whole pairing and unpairing procedure. So same here, I just end up plugging it into the USB AUX.