我是用LMP91000来设计电化学测量系统，按照规格书要求配置了相应的参数，是可以在电化学传感器的W和R之间输出固定电压的。现在我是在Vref端连接一个可变的电压，然后再配置不同的百分比（BIAS--REFCN -- Reference Control Register (Address 0x11)）来实现W和R之间电压的线性变化。测试出来发现有的时候电压输出和计算的不一样，具体表现为这些电压会在上升趋势的情况下突然向下跳变然后再慢慢回升到我配置的电压（有的时候上升一段时间后就不上升了，达不到我想要的电压）。这个可能是什么原因导致的？
I'm using the LMP91000 to design an electrochemical measurement system. I've set up the corresponding parameters as per the spec sheet, so it should output a fixed voltage between W and R of the electrochemical sensor. Currently, I've connected a variable voltage to the Vref terminal and then adjusted different percentages (BIAS--REFCN -- Reference Control Register (Address 0x11)) to achieve a linear change in voltage between W and R. However, during testing, I've noticed that sometimes the output voltage doesn't match the calculations. Specifically, these voltages tend to suddenly drop while on an upward trend, then slowly rise back to the voltage I configured (sometimes they stop rising altogether after a while, failing to reach the desired voltage). What could be causing this issue?