As Ray mentions, worth getting (both) wheels rebuilt with quality (DT or other) spokes.
If its happening at the hub end, it may also be poor fit into the hole- face of the hub. I used to do one a month on a crappy STX-RC rear on my mtb commuter
The pulling off from the ights scenario is probably due to the 'torqueing windup' that occurs due to the power transfer from the drive- side of the hub to the non-drive side. the non-drive side 'catches' up and gets twisted placing huge forces on hub/spokes (this is all incremental, mind). Is there any consistency of spoke location/side?
Love to see a 'wheel-building-machine'! Have images of 'Go-Gadget' contraption with telescopic arms flying all over the place 😄
