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@Smallfurry
Is it possible that having three spokes crossing at the same point, all laced heads-in, has caused this?
The tensioning/detensioning cycle the wheel goes through while turning under load, could act to stress the hub flange lateraly. I imagine the hub shell is'nt designed to undergo this sort of stress cycle. Radial heads-in causes the same stress, but not with three spokes focusing the stress to the same point on the flange. Pure speculation though, as I really dont know much about the crows-foot pattern. For patterns with no crossing or crossings away from the flange. I would have also gone with heads-in for the improved bracing angle.
Just some thoughts. Still most likely a defect. Good to hear your being sorted with a replacement.
(ED: If the spokes are 'unhappily' crossed. Should'nt a spoke elbow fail before the hub flange?)