Hi I actually posted the Fix last month. Let me get it for you.
1)Delete Android Auto from the phone in Play store
2) on phone- settings- connections-bluetooth-advanced-three dots in right corner- find Ring Tone Sync and turn it off. that is causing the loop that never ends.
3) reinstall Android Auto
4) leave car off , no key for 5 minutes
5)go to radio- home screen-settings-system- go to phones and select the little pen/pencil icon and forget the device.
6) turn car off for 3 minutes
7)reconnect the phone.
