What could be the reason for a vehicle with an 8-speed automatic transmission to jerk when shifting from 3rd to 2nd gear?

My 2018 GS7 has run over 50,000 kilometers. Occasionally, I feel a slight jerk when shifting from 2nd to 3rd gear. What could be the reason for this?

My 2012 C30 has been driven for 78,000 kilometers. Now, when I drive, the 2nd and 3rd gears feel jerky and lack power. What could be the reason?

What viscosity of engine oil do you use for your new Mazda5? What's your fuel consumption? And does your transmission shift from 1st to 2nd or 2nd to 3rd gear smoothly? I'm experiencing some jerking.

What could be the reason for a vehicle with an 8-speed automatic transmission to jerk when shifting from 3rd to 2nd gear?

What could be the reasons for not being able to shift gears?

What could be the reasons for not being able to shift gears?

Does the S gear shift up and down? Why can it only be in 1st gear and not in 2nd, 3rd, or 4th gear?

[Shocked] What's up with this car? Starting in S mode, I floored the pedal, the RPM hit 4000 and it was still in 2nd gear without shifting up automatically. It only shifted to 3rd gear after releasing the throttle for 3 seconds.

Is it normal for the car to shake when downshifting from 3rd to 2nd gear while braking?

I have a 2021 model Santana. When I'm driving between 50 to 60 km/h, the gear is in 5th, but the display shows 2nd or 3rd gear. However, the 2nd and 3rd gears seem to be neutral. What's going on?