Help with JBL Bluetooth

Sorry if there is already a post covering this. I really don't like using the Bluetooth for phone calls but do really enjoy using it for music. When I use Siri or make a call or receive a call the phone/ car tends to get really confused sometimes audio coming out of both at the same time. I found in the settings in my car where I can "disconnect for phone" and that works. Just music- perfect! ... Until I turn off my car. Then back to the beginning. If anyone has any advice I would really appreciate it.