哪位高手能解释下？谢谢！

在CST仿真时出现下面的错误：
The calculation seems to be unstable！ Consider reducing the value for the stability factor in the solver specials options or reducing the PBA fill limit in the special mesh properties/advanced.
哪位高手能解释下?怎样改正?谢谢！

把不检测能量衰减，不只对不对，