Manish Dubey
Ansys Employee

Its hard to predict what can be a problem without seeing a model. It can be a material modeling issue or share topology.

1) Does unshare topology worked with imported load and nonlinear material model? - if yes then it might be issue with share topology. 

2) Does linear material model worked for imported load and share topology option? - if yes then it might be material modeling issue. 

You may need to try some nonconveregence diagnostics and see if that works, 

Try with direct solver, susbteps looks fine and use stabilization (reduce energy dissipation ratio) under nonlinear controls.