Convergence problem with frictional contact

[IeraS]

I have a torsional spring with no initial contact betwen the coils(gap=0,7mm). When I solve the problem with frictionless contact the model converged, but when I apply friction no.

I am using Friction coeficient 0,1, augmanted lagrange formulation, asymetric contact and add offset ramping effects interface treatment. Apart of this the force is applied in 2 steps. (i'm using Ansys Workbench 16.1)

Thanks!