Falha na transmissão do símbolo Renault

Greetings, recently bought a 2008 Renault Symbol with automatic gearbox, the mileage of this vehicle is 25000km and is in very good condition but it has a strange behavior in the change of speeds when it decreases, when the car is accelerated and a speed is already perfect but when it almost stops completely, for example in some traffic light, the box makes a very abrupt change when it cuts and when it is accelerated again and when it is again perfect and when it is the time it is possível e o que posso fazer para repará -lo? Eu realmente aprecio sua ajuda.

Good evening friend, I tell you that I had a 2006 frog symbol but synchronous and I leave my broken pockets, the engine is 1.6V, what I can recommend is that you take your vehicle to the concessionaire or a mechanic specialized in Renault, because the minimum valve has to see a lot with the air conditioning compressor and the velocimeter sensor of the box also has to do with èl, what I want to imply is that if the minimum valve this defective one Pode ser o que está produzindo a falha porque o motor o revoluciona demais e ao interromper o veículo apresenta essa batida.