Try updating Android Auto onboth the car and your phone. Then try pairing them together. If the problem continues try unpairing your bluetoothing thethering connection within the bluetooth settings of your phone and reconnect again by pairing and see if that fixes the issue.
Try resetting the network settings on your phone.Also if you have a VPN installed that runs your apps data through it also that can give android auto issues.With my phone I have to make sure android auto is allowed outside the VPN in order for it to work.
