This is likely an issue with current draw causing a drop in USB supply voltage. This then causes issues in the measurements, likely causing saturation. Attach an error event to the CurrentInput object and check if you are getting saturation errors events. If so, the best possible suggestion is that, assuming you are using the 24V supply from the DAQ1400, if possible run it at 12V instead. That will greatly reduce the current consumption. Also providing a stronger USB supply voltage by using a powered USB Hub may help the issue as well.
If possible, attach the datasheet for the sensor you are using so I can take a look at it.