Mario

I agree with Dave,, check out for yourself if the data is getting corrupted.
I worked for a company a few years ago were we had a similar problem with
EEPROMS we would send to customers for program upgrades.  The customer
would get them and they wouldn't function. Verifying the programs would
show that the data was corrupted.  The same thing would happen with UV-
erasable EPLDs.
As a test we ran many samples of programmed devices through our Circuit
Scan machine with no effect but when run through the Airport's Machines we
did have some random failures.  The manufacture couldn't explain it.
We started packaging spares in a heavier silver ESD packaging and the
problem mysteriously went away.
We never had a problem with completely assembled units, possibly because
they were in metal cabinets.

I don't know if this helps at all but good luck
Hope you solve the problem.

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