DAC122S085: Initial DAC output is not 0V

Part Number: DAC122S085

Tool/software:

Hello team,

My customer is observing some of DAC122S085 not outputting 0V after power on reset.
Some parts output 400mV after power on reset.

From the datasheet, it should output 0V after power on reset.

What might be causing this behaivor?

Is there any specific initialization sequence?

Best Regards,
Kei Kuwahara