A friend of mine who works in the embedded space recently had a very similar bug. The component would crash when he stood up from his chair. Apparently the hardware connections were so sensitive that tiny bursts of static electricity through the air were enough to disrupt the whole setup.
If you put an LED, resistor, and MOSFET in series and then attach the gate to a wire, you can often switch the LED on and off by waving your hand around the wire. If you have an oscilloscope, hook it up to the resistor and see if you can find a position of your hand that will switch the transistor at 60hz :-)
This is quite common when working on unshielded electronics. Standing up from a chair, depending on clothes and chair fabric, generates a huge amount of static. Even just walking past can be enough.
Proper hardware development labs have antistatic carpet etc., but in embedded software development, one often doesn't have this luxury and has to be aware.
