Hi VW11,
It sounds like you are experiencing issues playing music from your iPhone in your car. We can help with this.
You mentioned that you are using an Apple cable to connect your iPhone to the car, are you using CarPlay or just the car stereo interface to play the music? If you use CarPlay, this resource might help: Use CarPlay with your iPhone
You can find out more information about connecting your iPhone to your car stereo here: How to connect your iPhone, iPad or iPod touch to your car
Make sure your iPhone is up-to-date and your car stereo is running the latest firmware. You'll want to contact your car manufacturer to inquire about firmware updates for the stereo. Just be sure to back up your iPhone before updating, you can find out more information about updating here: Update your iPhone, iPad, or iPod touch
Cheers!