Hi Kawshik,
At this point it is hard to say if this is expected or if there is an issue. In some devices, it can take a long time for the energy in the simulation domain to decay. What is the mesh accuracy that you are using? As a starting point I will recommed you to reduce the mesh accuracy to 1 or 2. Then increase the simulation time by 10 times, to see if you are able to reach the auto shutoff level.
Let me know what happens.Â
Regards,
Amrita
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