From the start the machine starts to move in first gear, then the acceleration goes to the second, then third, etc. After stopping with the engine running (for example at traffic lights) is not transferred to the first gear. Remains at the third, which therefore makes it difficult to follow the beginning of the movement. Said that includes a third emergency third gear. After turning off the engine and then turn it on again triggered the first program again, etc. What could be causing this malfunction. Thanks in advance.