I've had my 2014 for about a year. The car shudders and hesitates from a stop after the engine kill in eco mode. This is similar to the Prius my wife drives. When i had my car in for Service A last week, they gave me a 2015 as a loaner which did not have the hesitation and shudder. I asked if there had been a software update to address this but nobody at my dealership knew of one. Any thoughts? Similar experience?