Listening to music in my car, the volume goes up and down on its' own. I can have the volume on my phone and the car all the way up, and it sounds like 30% of what my iPhone 11 was.
In addition, the "quality" of the sound of the music is changes as well. I have the settings on "loudness".
iPhone 12 Pro Max, iOS 14
Greetings Be Huge,
Thanks for visiting the Apple Support Communities! It seems volume is changing unexpectedly while listening to music with your iPhone connected to your car stereo.
Does the behavior persist with multiple music apps? Are you able to test your car stereo with a different audio source to help isolate the behavior?
Check out the troubleshooting in the article below, including checking for a firmware update to your car stereo:
How to connect your iPhone, iPad, or iPod touch to your car - Apple Support
Kind regards.
So are you using regular bluetooth, or Apple Carplay when connected from your iPhone 12 Pro Max to car?
iPhone 12 Pro Max Sound Issues
