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HDC2021: Sensor Register misbehaviour- Critical

Part Number: HDC2021

Team, 

We are using HDC2021 and we have few  observations and we would like to clarify . 

Settings
Sensor  Supply Voltage  : 3.3 V 
Frequency 100KHz
With the above are the settings  we face 2 issues . 

#1. when we read all register settings  from the sensor we could read the settings which is written by us and temperature , humidity registers are 0. I have mentioned  the data which is read from the sensor 

Register values - 00,00,00,00,00,00,00,60,00,00,45,69,00,ff,54,00#

#2. Sometimes the adc values of temperature and Humidity from sensor is 0 and  FFFF .Please help with this as we  are facing these kind of issues frequently