Xt automatic emergency suggestion.

Hello to everyone. I have a 2003 model 307 xt vehicle. I have difficulties written here in my car before, I really need help from experienced friends. The problem is that I get into the car without trouble. It only makes a slight knock when the engine shifts from 1st gear to 2nd gear ... But let's handle it, but the real problem is doing it on the long road. When I take the snow code and go to 4th gear, I keep on d and continue. However, when I enter the traffic at the end of the road, the vehicle also gets up this time, but the gear shift cycle reaches the 4000s and hits a lot. There is no problem at normal short distance, but as I said, when I go to fixed and high speeds, the car somehow gets stuck in 3rd gear. I searched a lot and couldn't find a solution. Can you really show me a way What can I do?

In fact, he says, after the car warms up, such a problem arises, but I think it might still be a problem, as they say.

I think have the solenoids checked. As the vehicle accelerates, it cannot provide enough pressure and protects it. Take it to an original error reading device without taking it left or right, the transmission looks at the error codes. There is a possibility that the pressure related error occurs.