Anyone know the possible cause or had this issue. From a dead stop the trans slips for a few seconds then all of a sudden grabs. There is a sort of clunk when it grabs also. It happens intermittently. It will go days without doing it then it will slip several time when we are out and about. Dealer says bring it in but they have no idea what could be wrong and said if it is intermittment it may be hard to diagnose.