AD783 Offset

I'm using an AD783 sample and hold op-amp IC to store the signal from an Op-amp integrator for a short period of time so that the voltage can be read by and ADC DAQ card. Unfortunately, I get a large DC offset (as high as 200 mV) during the hold step, and this offset changes depending on the signal level at the input. Has anyone run into this issue? Any ideas on how to solve this problem? The offset should only be 5 mV or so max according to the datasheet. Thanks!

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