ADG731 used to monitor in system voltage and current values but ocasionally causes the values to be pulled to zero?

I am using an ADG731 32 channel mux to monitor 28 points in a system and transfer the levels to a serial A to D. the duty cycle is about 2.3 seconds whilst thetest takes in the order of  164 ms. sometimes during the cycle the addressed channel pulls the applied input voltage to zero for the dwell time of the sample and hence the reading presented to the A to D is zero.

Are there any known issues of this kind and how can i correct the way we address the device, as it appears to be associated with the addressing and chip select.

Many thanks.

Peter

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