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rruff said:
My first guess would be that the spokes are not properly stress-relieved. On center-drilled rims like these I even bend the spoke above the nipple so that the spoke enters the rim at a better angle. Else you will get a significant bending load right where the spoke exists the nipple... which is threaded and much weaker than the rest of the spoke. The bending load will fluctuate as you ride the wheel, and it will eventually fatigue.

exactly my thought - you can generally look at the spokes and see if they have been bent/eased to properly stress relieved. If they are not the spokes comes out of the rim with a slight curvature.
 
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