[EricH]

How was your battery situation? I know I'm asking the obvious here, but were both batteries (main and backup) charged and on the robot? If both were not on the robot, and the main battery was extra low, then you need to make sure that both are charged and on next time. (Please don't ask me how I know, I don't want to go into that.) Of course, your robot may have gotten Mechanic's Syndrome.