The mooring stiffness and fender stiffness are 2.89e8 kN/m and 2.89e10 kN/m resepectively in your model, which may make the model's natural frequency to be very high and the forces on the joint/cable/fender are sensitive to the relative motions between the structures, which will require the very small maximum Error and Movement Limitations per Iteraton in the stabilty analysis and small time step interval in the time domain analysis.
To avoild this probl problem, I wonder if you can reduce these stiffness?
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