How can I diagnose Android Auto disconnects after upgrade: phone, cable, or car?

[Logan_C]

I recently upgraded to a new Android phone, and now my car's built-in Android Auto system is incredibly buggy—it frequently disconnects, the voice commands are unresponsive, and sometimes the screen just freezes. I've tried different USB cables, updated the phone's software and the Android Auto app, and even reset the car's infotainment system, but the problems persist. For others who have wrestled with Android Auto compatibility issues, what troubleshooting steps finally resolved it for you? Could this be a deeper issue with the car's USB port or head unit firmware, and is there a reliable way to diagnose whether the fault lies with the phone, the cable, or the vehicle itself before taking it to the dealership?