Read 12-3, delivery line roll prep has been a huge help to me with this issue. Also, monitoring power point #2 prevents the clubface opening at the top, which also comes along with this problem. Focusing on swinging up on plane after impact has helped much of this issue, which I have battled for 30 years with no relief until this site and the yellow book. You will find the answer here. Dropping the club underplane on start down is a wobble. Sometimes the cure lies elswhere in the swing.