Car Will Not Accelerate problems of the 2012 Kia Motor Optima Hybrid

This car severely hesitates/stalls after coming to a stop at intersections (red lights, stop signs, yield signs, and etc). Car hesitates/stalls for 2-3 seconds before accelerating while at a dead stop. This has causes several near accidents and scares to my family, friends, and myself. This morning, I pushed the gas pedal to the floor and the car did not accelerate/respond until 2-3 seconds later. This is serious and dangerous problem, while pulling out into traffic incoming cars can close the safety gap quickly in 2-3 seconds. Cold weather causes the car to hesitate/stall more often than warmer weather. I urge the federal government to step in and force kia to find solution to this problem before this issue cause a fatality. Fuel economy is another issue in this car (hybrid), I typically don¿t get the estimated 35 mpg/city that the dealership sold me on, it is usually 28-30 mpg/city.