>Did you actually check the datasheet?  The "nominal" 4.6v
>brownout level could be as high as 4.87v in practice. That
>gives you just 130mv head room from your 5v nominal supply...
>
>Sounds like you simply selected an inappropriate brownout voltage,
>possibly coupled with small voltage transients on you design.

I also wonder when the DVM was last calibrated, that he was using (least 
that was my first reaction to his message where he said he had measured the 
voltage).

It is all too easy to be using a DVM which doesn't really have the accuracy 
(some of the 3 1/2 digit specs are horrible for absolute accuracy), and 
assume that it is right, because it has those magic digits on the display. 

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