NOD I think what you're referring to is when flying a higher selected speed than cost index climb speed in the FMGC whilst level, then getting a climb clearance and pulling open climb then managing the speed. It's your naughty FOs flying higher than company CI, increasing engine internal drag and wasting fuel. In this case it'll come back to idle. It gets me once every 6 months. Pushing EXPED then straight away pulling OPEN CLB or pushing CLB locks the thrust at CLB thrust and prevents this.