I drive an Infiniti fx35 2005, the car drives amazing. Transmission is usually perfect. Although it when it is below -10 Celsius it will sometimes shift gears at unusual times. For example it seems to downshift while I’m driving at a steady speed - can be while in second or in 4-5th gear. I won’t be pressing the gas any harder and it will do a downshift that is a little jerky then go back to being smooth. It’s hard to explain. Any insight ?