[MrForbes]

It's possible, but it still looks unlikely. The openings in the top of the case are very small, the gap between the transistor and the plastic part is very small, so it seems that for a shaving to get in there, it would have to be so small that it would not be large enough to short the pins together. There are other ways for electronic components to fail, than to be shorted by foreign matter, aren't there?

That said, we haven't had any problems, we've been using 4 Jaguars since the end of December. We also haven't been doing any drilling of metal above them, since they're located in a wooden enclosure that is mounted vertically and has it's opening facing away from the rest of the robot.