Check the 6 bolts that hold on the axel driver flange. This has happened on mine so I need to either tap new threads and go up a bolt size (bodge) or replace the hub.
I find these videos interesting. Even though they are all basically the same the S1 has strengths as does the 90. Interesting to see the S2 ground out on the waterfall on the diff crossmember and tow ball where the others didn’t.