There are a few ways to remedy this:
1: modify those diverged files and make sure they run normally. then using the script to get the band structure
2: modify the original file to make sure it dies not diverge. You can use symmetry BCs, modify PML, increase the distance between the objects and PML, modify material fittings, make the simualtion short (eg, the progress percentage to 95% or so)
You may also refer some guidelines on dealing with diverging simulation.
please do not run too long the simulation time, as it needs to capture those wavelengh/frequency that have small Q factors.
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