Hello, thanks for your question!
This doesn't necessarily imply that there is a numerical error in your simulation. Often when we see an oscillation in the auto-shutoff value, it might mean that there are some resonances arising in your simulation and it can take a longer time for the energy to sufficiently decay to the auto-shutoff level.
There are a few things you can consider:
- You can check your boundary conditions. If they are PML, then you will want to double check that you are not getting any non-physical reflections from the simulation boundary.
- You could slightly increase the auto-shutoff from its default value. The oscillations are very near the default level so I don't expect it will have a huge impact on the results, but if the simulation is terminated too early you may see some non-physical ripples in the spectrum.
Ethan
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