Does anyone who uses android auto plugged in via USB notice that their phone gets very warm, I wouldn't say mine gets excessively hot but it does get very warm and I worry that the amount I use it in the car if its warm for that long Monday to Friday 9-5 it could damage the battery. My phone normally is absolutely fine and only gets warm if your doing many tasks or fast wireless charging.
Does your car support bluetooth? Just thought that could be an option istead of using Android Auto because you definitely don't want to ruin the battery in your phone. Especially as (this is only from what I have heard, you might be having better luck than other people) the battery in the s20 series isnt great. Hope you manage to fix the problem.
It has bluetooth but only for calls and music if you want android auto you need to plug it in, the battery in the s series isn't the best, I was one who moaned about it but other people I have spoke have said I am not getting a bad sot and I think its just because I'm using it alot
Mine has never got that far but its very warm when I unplug it, if I use it for like 30 mins it's absolutely fine it seems to happen when the battery gets close to full as I can't prevent it from charging while connected.