Maybe try removing the SMS permission from the app?
Settings - Apps - Android Auto - Permissions - select SMS - select Don't Allow
If that doesnt work, maybe try going into 'Storage' following the same steps as above to Android Auto, and then clearing the Cache.
...Then theres the 'In App Notification Settings' at the bottom of the Android Auto app section, where you could try toggle the options On/Off to see if that helps?
Have you downloaded the 'Good Guardians' app from the Galaxy Store, and with it the Galaxy App Booster? ...if not, do it, and run the App Booster, and hopefully thatshould help.
All that aside, I'd recommend following the instructions on this video to reset your phones cache; you might need to connect your phone by wire to a tablet/PC/whatever to access the menu when restarting your phone, as it wouldn't work for me without doing this.
Hope you get it sorted, but I'd try the options I listed in the order I listed them.