Well I have heard back from North through the Collaroy shop. They say I have been riding up and down the beach or over rocks, and I must take responsibility for that. If I did, I would!
I do not ride up & down the sand or over rocks as they say, the fin does have marks from going over the sand bar, part of riding in the surf. They have not explained why the cracks are in the opposite direction to what you would expect if I was beach riding, and why it is happening across on both sides on one end of the board.
My theory, fatigue! Guess what North, other people are having the same problem, looks like a design/manufacturing issue to me! I understand you are trying to protect your profits, but a board that costs $1,350.00, 30%+ more than other boards should not do this.
North foot straps / bindings are poor quality, the front edge wears out within one season, this board needs its 3rd set (yes at 2 yo). I have lost 3 heal inserts, I now glue the inserts in, and the base pad has had to be repaired as well. If this was the only problem I would live with it.
I have owned quite a lot of your products, but after this board, the cost verse reward does not stack up,
North, NO more (and yes I am bitter about it!).