Hello Rob,

I apologize for the late reply. I was involved in some other project for a year. Now, came back to the same previous simulation project.

As, you have suggested to me, [In that case the solver is recalculating the adaption registers as part of the solution twice when you restart. The gradient data is not saved in the case file, so there must be another step as you restart the model. Instead of going straight to the calculate button on restart try using
it 20
in the TUI. This will continue the time step rather than moving onto the next one. This may mean the gradients are recalculated before the next adaption register and cycle is carried out.]

I did the same but the problem is still continuing.

Extremely looking for your support.