I just sent my second Ironclaw with the same issue back to the shop where I purchased it. The wheel broke in the same way, and after about the same amount of time - around 4 months. That was without any excessive gaming use (mostly work).
The Ironclaw is the first mouse I found that is really comfortable for me, but after 2 units with the same issue, I don't think I can trust Corsair mice again. I have a Corsair keyboard & headset, but I think as soon as the return is credited to my account, I will be buying a different mouse.