> We've already been in touch with one of those companies- they have done
> quite a bit (though not enough) for us already.  THEY claim that this was 
> a
> simple case of overvoltage- our power supply was too hot, the chips fried,
> end of story.  Nothing I have done has repeated that, however, so I'm VERY
> skeptical about it.

I guess there is always the possibility that your customers have had a 
failure on their test station that is stressing your module in some way. It 
may not be apparent to them if the failures don't happen until the units are 
out in the field. For two different customers this is a bit of a stretch, 
but .... 

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