I have not had any issues with my Edelux until my last brevet, which had considerable amounts of washboard gravel roads.
As night approached, I reached down to turn on my lamp and BZZZRT! I got a pretty hefty shock to the fingers when I touched the lamp housing. It happened a second time when I groggily forgot about the first time, and reached down to adjust the lamp position.
It only happens if I'm at speed, or have just recently stopped after a riding for a while. When cleaning things up a bit yesterday, I gave the wheel a spin with my fingers on the lamp housing and didn't get juiced (at least not that I noticed.)

I did notice that my standlight is barely functioning right now, and that regardless of the switch position the light was staying on. Does it sound like I rattled the internals loose somehow without dislodging the LED (since the beam pattern is still fine?) Is the high-powered zap the standlight cap discharging when I touch the housing?