Help repair Renault Automatic Box

My car presents failure in the box is left without making changes only when it is forced while I keep it in low revolutions makes the changes but if I do it a lot, there is a blow as if I made the change and then it no longer makes any change I set the focus of the transmission, I turn it off and turn it on and come back to work

Hello to tdos, if the witness of the box is lit ... It means that Swe detects a problem in its control circuits, scan it. In any case, it would help to know the model and year of Renault, to help you. Greetings.