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TMP461: Failing to ACK - Potential bad batch?

Part Number: TMP461

Hi, 

I am using the TMP461 (TMP461AIRUNT) on several CCAs. Half of the temperature sensors work as expected when addressed and the other half fail to acknowledge and issue a Stop data transfer. What are the reasons the TMP461 would fail to acknowledge? 

Have there been any known bad batches of TMP461AIRUNTs? I noticed that the CCAs that work correctly have TMP461s with the following markings:

ZDW1

8CF

S31E

The CCAs that do not communicate with the TMP461 temp sensor have different case markings:

ZDW1

99F

S47K

A screenshot of the I2C signals when the TMP461 fails to acknowledge.

Thanks!