Apple Car Play

Hello together, I have the weird effect, as soon as I connect Apple Car Play, I can no longer make calls via the voice command. There always comes the message, I should connect a device to the car. But I choose via mobile phone it is transmitted normally via the speakers of the car. If I delete the device and reconnect again, Apple Car Play does not connect, it works again. Does anyone have an idea or a solution? Thank you. Greetings Miro