Is it disconnecting or freezing? I was having an issue with my Note 8 freezing and it seemed to happen over bumps or after around 10 min consistently. I tried all the suggested fixes then noticed that under connected cars my car was there twice. So I deleted the cars, then re added it. Then turned off "add new cars when connected" or whatever it says. Hast frozen since. Yours might be a different issue but if all else fails you can try this.
Android Auto Constantly Disconnects | Android Central
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