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PCA9554A: Comm Lines Failures

Part Number: PCA9554A

I am using the PCA9554ARGTR to drive several LEDs. Recently I have had this IC fail several times in the same manner. In each case either the SDA or SDL lines (or both) stopped functioning with an apparent open circuit occurring inside the chip. I've had the components X-Rayed, but there is no obvious damage or fusing of the bond wires. I'm curious if you have heard of a similar failure mode with this chip in the past and what may have caused it. I'm not able to replicate the chip failure in the lab so its proving difficult to track down potential causes.  Any assistance with this matter would be greatly appreciated.