A common cause that leads to the wrists rolling over early is when the lead elbow breaks down-and-in too soon, negatively impacting the swing plane. The fix here is to correct the lead arm (some will say elbow), and when you do, the issue with premature wrist rollover goes away.
What is the proper action of the lead elbow (as opposed to down-and-in too soon)? ...
Should the lead elbow follow a should-to-shoulder plane?