After the vehicle accelerates to 110 km or more on a long road, while the speed decreases, it engages a certain gear, does not shift down, and turns on the transmission malfunction light. When I switch to manual, if it gets stuck in 4th or 6th gear, it doesn't clear up unless I stop. After stopping and driving in L gear for a certain period of time, the malfunction light goes off and it returns to normal. But when I get to the speeds I mentioned, it does it again. When I connect the vehicle to the computer, it gives code P0715. We changed the vehicle's Input Shaft Speed Sensor, Output Shaft Speed Sensor and Transmission Position Sensor. We also checked all the lights such as stop lights, brake lights, etc., but we could not solve the problem. If anyone has experienced this before, I would be happy to help.