Issues with Convergence of APLAC Harmonic Balance Simulation

I've been having continued issues with getting a harmonic balance simulation to converge. The simulation in question is of a superconducting transmission line with non-linear inductance, modeled as a series of RLGC transmission lines connected with nonlinear inductors. The simulation converges as expected up to a certain input signal power, but when I attempt to increase it further, a warning is thrown for every single inductor in the circuit, and the simulation fails to converge. I've tried all the suggested methods for troubleshooting this, and so far none of them have worked. The error thrown reads: "Value of (NLINDA!(insert nlinda id here).REST.ExtractNetwork.ResT < RMin (changed to 10.000u)".

All of the inductors and transmission lines have a resistance of zero (as this is a superconducting circuit). I've tried addressing this error by setting the Minimum Resistance in APLAC sim settings to zero, to no avail. I've also tried adding a conductance to all non-linear components, which also had no effect.

This issue started when I introduced periodic discontinuities to the transmission line: sections with altered capacitance, specifically. However, I'm still unsure what the source of the error is, and why the simulation doesn't converge.

All help is appreciated.