Hyundai Genesis Stalling Problem. Dangerous! Please Help

Guys, this is my first post. I am actually writing on behalf of my father. Today, and another time before, his 2009 Hyundai Genesis stalled while driving on the street. The engine just turned off and all the warning lights came on in the car. He was almost in a severe accident because of this! My mother too also uses this car to shuttle her grandchildren around and I am worried. I have read a thread here and other people have described the exact problems my father has been having. The first time this incident happened, the Hyundai dealer suggested there was sand in the gasoline. Apparently it was fixed but it happened again. Some people have suggested that it is the ECU (electronic control unit) or the ETC (electronic throttle control). Has anyone come up with a solution? Please, I really need your help. If anyone has had the same problem and have come up with a solution, would you please email my father at:

donr(at)sevengables.com

Thanks everyone. Your help is much appreciated.
David