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Hi, all,

I designed a small device about 2 years ago, which can be operated in two
different modes. Switching to mode 2 is only done here at the factory by
pressing a key in a specific pattern (Press 10 seconds, then wait until
light is off, then release key between 2 and 4 seconds, wait until light is
on again, then press 4 times within 3 seconds, someting like that). The
state of mode is stored in eeprom address 00, 0x00 for mode 1, 0x80 for mod=
e
2.

Now during the last 3 weeks about 10 customers called to tell, that the
device is suddenly operating in mode 2, even if it was shipped in mode 1.
The procedure to change mode was never made available to the public and
futhermore there is no advantage at all for most customers to change mode.

Question: Does anybody have information about the reliability of eeprom
content?
How is it possible that eeprom content changes (electric field, magnetic
fields or or or)

Thanks for hlep.

Peter

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