Sorry for forgetting the specifics.
NetOS 7.4 and the only writing we do is the built in filesystem and FTPing in image.bin files.
What is interesting is that we have never had this problem on the old straight ME where we write firmware directly to the flash. Also the 9210ME would die occasionally, but a simple reboot would fix it. Now they act like the program is gone, not even booting. I have three of these, two have been returned and recovered with the TFTP boot option (shorted pin 18), but the third is still in the field.