I've seen this happen a lot in PICs that aren't adequately decoupled.

Check you have a decoupling capacitor (or capacitors) as close to the power 
pins as possible. Try the circuit with a 100nF + 10nF + 1nF in parallel to 
the power pins.

Are you using an internal or external oscillator ? It could be the 
oscillator design becomes unstable when the extra capacitance of the human 
body enters the equation.

Dom

----- Original Message ----- 
From: "Quintin Beukes" <quintin@last.za.net>
To: <piclist@mit.edu>
Sent: Tuesday, September 22, 2009 3:39 PM
Subject: Static Reboot


> Hey,
>
> We discovered a very odd problem with our PIC18LF2520's. When you
> approach the PIC it reboots. With some experimentation we found that
> it's because of sensitivity to static electricity. In other words
> grounding onself it doesn't happen, and deliberate charging causes the
> PIC to reboot at physically further distances depending on the amount of
> charge you're carrying.
>
> This is bad.
>


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