Hi Kizmiaz112,
We understand that this is only happening while you're using the Apple Music app in your car, correct?
Have you deleted and reinstalled the Music app? If you need help to remove the app, you can reference the steps outlined here to do so: Delete apps on your iPhone, iPad, and iPod touch - Apple Support
"How to delete an app
- Touch and hold the app.
- Tap Remove App
.

3. Tap Delete App, then tap Delete to confirm.
Keep in mind that some built-in Apple apps can't be deleted from your device, so you might not see the option to delete an app. Here’s a list of built-in Apple apps you can delete from your device. If you can't delete an app that's not made by Apple, disable parental controls, then try deleting the app again."
Once you've removed the Music app, you can redownload it via the App Store.
Another option you may consider is ruling out the possibility of Bluetooth interference. Typically, audio interference is due to wireless interference. This resource will guide you: Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
"Symptoms of wireless interference
Any of these symptoms could be caused by interference affecting the Wi-Fi or Bluetooth signal:
- Device doesn't connect or stay connected
- Connection is slow and signal strength
is low - Bluetooth audio skips, stutters, cuts off, or has static or buzzing
- Pointer movement is erratic or jumpy"
We hope this helps.
Kind regards.