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OPA128做电压跟随器无输入时有输出电压

Other Parts Discussed in Thread: LMP7721

我用OPA128KM做了个电压跟随器,电路图如下所示。用±15V电源供电,输入端(3号脚)悬空,打开电源后用示波器会测到-200mV左右的电压。把输入接地后输出会为0,但撤去接地后,输出还会缓慢降到-200mV。请问是为什么?