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@M_V
It sounds like a Ping so I'd suggest spokes but derailleur is in wrong position to be catching them and wouldn't explain not happening on another bike.
The chain went slack at one point, was that coz you were changing gear? If not look at free hub, free hub bearings, pawls etc.
Again though, not much there that explain it being only on that bike.
What type of hub/bearings? If sealed are they loaded only by the closing of the skewer ie Hope? Could there be an issue with dropout thickness and axle length?
Have you checked to see if the dropouts are parallel?