Hi,
It is hard to tell if this is expected or not. For certain geometries and source parameters, the auto shutoff can drop very quickly. In others, cases when the device is operating close to the resonant wavelength, it might take much longer for the fields to decay.
Do you see the expected results from your monitors? What is the mesh accuracy you are using? We usually recommend users to perform convergence testing to confirm the validity of results. I will recommend you to run the simulation with increasing mesh accuracy and see if the results converge.
Regards,
Amrita
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