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LTC1859 erratic data

We are using an LTC1859CG#PBF  analog to digital converter in one of our power supply assemblies (102303) .  On one data code (1926) we see erratic output data form several channels that makes our calibration of the power supply impossible.  As soon as we change to a later data code (1723) the problems go away and we are able to calibrate properly.  The data appears to rail to the maximum input ranges and is erratic.  

Are there any die differences between the 17 and 19 data code ADCs?  Were there any specification differences between the 19 and 19 data codes?