ADS1274: Chip failure Root Cause Analysis

One of our contractors created their own board design, using the ADS1274, and identified not faults in lab testing, HAULT, ESS, or EQT. Upon first article testing we began seeing high failure rates characterized by no DIO output from the ADC. Failure analysis began looking for changes in channel behavior and found Analog CH 1 no longer produced an output at DIO, though remaining CH 2, 3, and 4 were still operable. No identifiable signs of burning seen on the board, though we believe the chips still suffered damage from either the Analog Input, power, ground, or clock pins. We are considering delamination to  check for tansistor breakdown, but I'm curious if anyone else has seen this or has an idea what could cause such damage. - Brian Jaeger