Are you saying the successful first run had this joint suppressed and with it unsuppressed, the convergence stalls?

In the Solution Information folder Details window, type a 3 into the Newton-Raphson Residual Plot box. This shows you which elements are out of balance. I expect it is the elements that this joint is scoped to.

You could edit the joint and change the Mobile end to Deformable instead of Rigid.

Check that the Coordinates for that joint are near to the scoped elements.