2019 Audi A6 drivetrain & axles problems

I was slowing down to stop at a traffic light when a message was displayed on the instrument panel that says "Electrical System Malfunction" with a yellow battery icon. A few seconds later the same "Electrical System Malfunction" with a red battery icon. Then the vehicle came to a complete stop and was inoperable. There was almo smoke coming from the hood near the positive battery terminal. The smoke had an electrical smell to it.

At a stop light the engine will shut off completely requiring you to restart the car. This happens intermittently and happens when the auto on/off is on or off. Leads to dangerous situations when in city traffic or stopped at a red light on highway. Two trips to audi and there are no error codes on the engine to diagnose the issue. Makes for very nervous driving when every stop light may cause your car to stall. Most recent issue the car would re-start and immediately stall, and then started shaking violently.