I understand there have been significant quality control issues with the extrusions since Velocity moved its wheel manufacturing from Australia to North America. With two failures like that, I would be on to Velocity directly to complain loudly and for warranty replacements (if you are prepared to risk yet another failure).

I have had issues with Velocity rims in the past, with a factory-built wheel, that had pull-through problems with nipples, including one that took a chunk of the rim with it. One wheel was replaced under warranty, and after the second one showed cracking around the nipples, I gave up (I also was in a remote location away from the LBS where it was bought, so a warranty claim might have been more expensive for me than it was worth).