I have a '07 G35x sedan, in the morning I would start the car and wait 10 minutes or so and go. I am starting to feel the car jerk when its shifting to 2nd gear I believe but is all fine 15 minutes later when the car is totally warm. Is this normal or is my transmission going to die?

From stop position I press on the gas to go and it jerks and wont happen again unless the car is stopped at a light or something but is all fine after 15 minutes of driving. Not sure if its 1st to 2nd gear or the transmission locking on to 1st gear causing the jerk.