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IN333将输入信号拉低

Other Parts Discussed in Thread: INA333, AMC1200

AMC1200输出电压被INA333拉低,有时上电时正常,过一段时间后变低,有时上电时就不对。开始怀疑AMC1200有问题,后来换成电位器分压,开始正负为几百mV,过一段时间后变为几十mV。断电时测量电位器各段电阻,为均为几百欧姆,用的10K的电位器,请帮忙分析下,电路图如下: