Output acceleration is greater than the input acceleration

[Prafullamalla]

The output accelearation is same as input for about 0.1g, but when I increase the input accel to 0.3g then the ouput accel becomes about 6g. What might be the reason for the increase in output acceleration at the node.

[Prafullamalla]

The problem is due to non-convergence in the intermediate steps. When there is non-convergence in intermediate steps, it calculates unusual too Big value. Then in the next step, it again uses this unusual big value