Engine Shut Off Without Warning problems of the 2008 Hyundai Accent

On November 14, 2014, after coming to a stop,the engine shut off almost immediately, requiring me to put the vehicle into park or neutral to restart it. This has happened 19 times since. My concern is that this may happen while I am in motion and that if it did it might cause another vehicle to crash into mine. I have brought the vehicle into our local Hyundai dealer where it was purchased used in July 2014 to have this problem fixed. The engine came to a stop while it was on their lift being checked out. However, the computer did not provide any code to enable them to fix it. They suggested putting 2 bottles of dry gas in the tank but this did not fix the problem. I have alerted them that this contines to be a problem several times, but they don't know what to do about it since the computer finds nothing wrong. The local dealershop also consulted Hyundai technical service team and they were unable to give them any solutions. I reported this problem to Hyundai corporate customer service on April 10, 2015. I asked about the 100,000 mile drivetrain warranty and they told me that since the mileage is over 60,000 there is not much they can do for me. They said that they would try to look into this and notify my local dealership about it. The customer service case manager (joe) asked me what I would like out of this situation. I told him I wanted to get it fixed as it is a potential safety concern as well as a constant worry every time I am coming to a stop.