https://www.chiefdelphi.com/forums/s...d.php?t=145297
I'm not sure whether to laugh or cry about the fact that out of 11 years of FRC, the 2016 season takes the cake for strangest issue to date.
Anyways, here's the short summary:
"Sirius" got in the habit of randomly spinning up various motors to top speed... while disabled.
The issue affected PWM and CAN-driven motors alike, and even happened several times while connected to the FMS. Since this kind of problem is pretty much the very definition of an "unsafe condition," we were disqualified from play for several qualifying matches in a row.
Re-seating the wires in question didn't appear to have any effect, and re-flashing the code didn't help either. Running low on options, we resorted to completely reformatting the RoboRIO; after that, we were no longer able to reproduce the unsafe behavior. The FTA eventually let us back onto the field, with the understanding that we would need to swap to a loaner RoboRIO if the problem ever happened again.
For my part, I was never completely satisfied with the hand-waving explanation of "something must have gotten corrupted;" seeing as the problem never recurred, however, all we've got left is hearsay.