2014 Chevrolet Spark cruise control problems

A week after I got the car I was stopped at a red light and it just stopped. It has been doing this consistently for the last 6 months now. It doesn't matter if I am at a stop sign or a red light, but it is always after I have always started to drive the car and have come to a stop. The dealer can not find any code and has suggested I use a higher octane because sometimes when I put on the break it will accelerate and they think it is "starving itself".

Tl* the contact owns a 2014 chevrolet spark. The contact stated that while driving at various speeds, the vehicle failed to accelerate. The contact stated that the accelerator pedal was depressed however, the vehicle failed to move. There were no warning lights illuminated. The contact was informed that the transmission needed to be replaced. The vehicle was repaired however, the failure recurred. The manufacturer was notified of the failure. The failure mileage was approximately 79,000.