Mine was a reworked CV joint. I noticed that the balls were binding slightly in the cage after it was reworked. It was just a matter of time.

RCV has my spare set (to reverse engineer them). Even if RCV takes a while to build ours, if I can get mine back soon ...

I have the diff drops on mine as well so once I've got a good set in place, I don't expect further problems ... of course that's what I thought when I had the originals rebuilt