Thanks for the tip - the system in the car is up to date. it used to work before the system update on the phone. I have now reinitialised the phone and reloaded everything - so far it works now. let's see how long.

The problem could be the update. I would first pair the device with the vehicle. If that doesn't help, you can go to the garage to update the software in the car. Depending on the brand, you can also download the updates yourself from the Internet and update the car via USB stick. If none of this helps, contact Nokia support.