While sitting at a stop light at an extremely busy intersection, After pressing the Auto Idle Off button in trying to keep the air conditioner running, my vehicle just completely shut down like it had a completely dead battery. I couldnt even turn on my hazard lights. The vehicle was completely dead. After pressing the on/off button several times, power to the vehicle was restored and I was able to restart the vehicle. It reminded me of when a computer glitches and reboots on its own. By happening at an extremely busy intersection, I felt like my safety and the safety of others may have been in jeopardy if other vehicles would have made aggressive maneuvers to get around my inoperable vehicle.