More than half the failures I have seen are 'electronics/firmware' problems. Ie. It is not caused by degradation of the flash memory, but instead caused by th

More than half the failures I have seen are 'electronics/firmware' problems. Ie. It is not caused by degradation of the flash memory, but instead caused by the controller going bad, refusing to initialize, having a bad internal power supply, etc. Obviously without the manufacturer's internal debug tools it's really hard to properly root cause issues.