We recovered units based on the OMAP L137 (silicon rev. 2.1) which have been running 24/7 over the last 2 years. 5 out of the 6 recovered units appear to suffer from the OMAPL137, AM17x, C6747/5/3, DA83x/2x/1x/0x IO Buffer Premature Aging Assessment issue on the EMIFB clock pin (133MHz, 3.3V). The failure rate is much higher than what's specified in the silicon errata:
What could accelerate (ex: exposure to high/low temperature) this issue and explain that failure rate?