Hey, so this past week, two times now, the vehicle on startup is fine, I go into drive to get out the lot, I let go of the gas to slow down, and rpm fades down to 0 and car shuts off. I notice, if I hit the gas to keep the rpm up, it would keep going, but letting go, it shuts off. What could it potentially be? Seems to only occur in eco mode and when the car is cold. Negative celcius temperature currently. Any assistance is greatly appreciated!