Hyundai Motor India — verna sx 1.6 petrol version

Address:

New Delhi, Delhi, 110085

On may 21, 2018, i was returning from greater noida, when i reached pitampura, the engine stopped while car was running on top gear @ 60 km/hr, i immediately took side lane to stop the car and meanwhile car steering was also got locked. As car temperature was fine, immediately i restarted car engine, which started normally within seconds. This happened with in 50 - 60 seconds. Than i drove to home 10 km as usually do.
Today i also drove about 50 km and didn't face any problem.
Veh. No. Is dl 4c ax 3868
All the services done at deep hyndai peragarhi.
Now my question is-
1) why it happened and who is / was responsible for it?