Ojdavies

So I have a strange issue and I’m wondering if anyone has experienced the same or has any insight how I can solve this. So when I start my car, plug in my iPhone to start carplay, start driving - after about a minute the audio channel changes from the music setting to the voice setting (usually pops up when I’m on the phone, using Siri etc) The only way I have found to get it back to music mode is activate Siri and then cancel. I haven’t a clue why this could be happening, would be grateful for any insight!