Transmission Sensor problems of the 2013 BMW X5

Hello, my name is yong won kang. I am 77 years old man and more than 50 years driving experience. I bought BMW X5 October 2013 from tenafly BMW dealership. This car was my lifetime dreamed car. Like a BMW sales slogan ¿ultimate driving machine¿ I would like to have an experience BMW car¿s joy of driving. But after few month later I was disappointed to have BMW X5. When I drive to accelerate push the gas car dose not respond as quickly as pushing gas. So I told the mechanic my problem they did software upgrade. After software upgrade car was good responding drive. But few weeks later back to old condition. These things four more times I did. Could you possibly help me out of these problems and my frustration? here are my problems: 1. Sluggish and hesitating running when acceleration 2. Between transmission and gasoline sensor problem?!(I think) 3. Not smooth transition and feel heavy moving 4. This is not BMW X5 power running weak. 5. Driving terribly heavily responding. 6. I was reclled for front airbag.