Many of us get The Shanks from time to time. It IS the most disturbing thing in golf.

All I can say, is that I have learned to fix it quicker than before.

I was doing this just a few weeks ago. Friend said something about speed of swing and lack of normal good transition from back to downswing.

What I did on range and then on course, was to first ensure good address position with slight change:

1. place club behind ball with ball nearer toe than centre.
2. step into ball and adjust foot position without moving clubhead (Gets you right distance from ball)
3. make sure weight is nearer heels than toes and keep it there during swing (don't lunge toward ball)
4. Imagine that clubface has an eye in the middle of the face that is looking at ball - take club back very slowly and very square (so the eye keeps looking at the ball). Club may not go back as far as usual which is probably a good thing!
5. Then swing down through the ball making sure you keep your body quite still.
6. Keep relaxed through all of this!

I start off in this way - it feels awkward for a while, but one I start making good contact, the swing frees up and I stop thinking about "it" - except to make sure I go through setup drill.