When,use R,P,2,3 all are working well,but when i use D/4 for driving ..not speed more than 60 k/mh.Its work fine.But,when im speeding more than 80 km/h .. after use brake and stop the car at traffic light.

The car not shift the gear ,sometimes its stuck at 1st gear some time it became to Neutral,even im not change the gear to D/4 to N.If,i still push the gas pedal,the blinking comes on ,i need to restart my car back.After,that everything becames to normal.

If,i still use D/4 and...