Hi There

I had a similar problem but was not actually shanking the ball, I was hitting the ball with a wide open club face that sent it way right. It was most noticeable on the range when practising a lot of pitching shots, suddenly I could hit nothing straight exept a chip shot where my wrists did not cock.

The problem with my wedges was due to swinging down with my hands too far ahead of the ball at impact causing a very late release of the wrists, this kept the club face wide open. The remedy was to release the wrist cock much earlier in the downswing.

Hope this helps
Brian