I had the same issue on a Hope Pro II rear hub earlier this year. The flanges with the spoke holes in broke in a couple of places, on both sides. The hub was about 6 months old and hadn’t been ridden all that far or hard, and with 6′ of plush Heckler suspension and 2.35 tyres to soak up the hits.
I had the spoke tension checked before it was stripped and sent back, all spot-on.
My LBS, who built the wheel, sent it back and Hope relaced the hub with no quibbles within a week (swapped my old freehub onto a new hub) but I had to stand the re-build costs.
A little worrying though for hubs that are supposed to be strong enough for DH. New one has been fine so far but I’m keeping a close eye on it.
For info it was built onto a Syncros DS28 rim, so that with the Pro II should have been a reasonably bomb-proof combination I’d have thought.