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TAS2552: non functioning amp, temperature issue

Part Number: TAS2552


we have produced 150 boards with the TAS2552 and are having massive problems: Out of the 150 pieces only 60 work. The remaining ones do not acknoledge I2C requests and are not reachable from the host perspective. The problem seems to be temperature related: When we deep freeze (to -20°C) the 60 pieces, another 30% fail to work.

We have Xrayed the PCB, exchanged the chips, changed power sequencing, measured voltages, checked I2C signals, and did not find anything.

Do you have any idea or had similar issues in the past? Any pointer is appreciated.

Best regards,