The bugginess I've seen in Android Auto in my personal vehicle (Pioneer 4100NEX) seems to have been more on the phone side (GPS signal issues, sluggish location updates at times), not so much with Android Auto either on the App side or the Head Unit side. I'm fairly confident this is the case as I have the same issues with my particular phone (Blu Vivo Air LTE) in Google Maps when not tethered to Android Auto as well. I'm dealing with it for the moment until I see what phone I'm issued by my next employer before proactively replacing it on my own dime.