I've put together a lot of wheels over the years and NEVER have I had a spoke break on a wheel I built. Until now.
Customer came in with some broken spokes and I suggested a respoke of the wheel, and that was done. He came back in last week needing some more service and to replace some more broken spokes. Hmm. All 3 were "outside" of the hub. installed under the crossing spoke and on the brake side.
Drop bar road bike with disk brakes.
I thought spokes only broke on the drive side.
Commence theorizing. I'll comment back as time allows.
-SP