>I'm not discounting firmware yet, other than I have
>two boards that have NO issues at all, while two others
>do.  And I can take a chip from one board, drop into
>the other and it works just fine.  Thats why I am looking
>for some sort of external stimuli that would be present
>on the bad boards and not the good, but the question
>is....what to look for that might cause such a condition.

ISTR that this is the sort of funny thing that can happen when ANY pin that
has an A/D input on it goes outside the VCC/GND limits. i.e. is any of the
other A/D inputs floating/tied to some strange voltage on the other boards?

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