I just had the DC-DC connector go out after hitting a speedbump too hard. In the process of trying to figure out why the lights went out, I had a look at the connections between the controller and the motor:
Oops. The other connectors in the battery - controller segment have all been upgraded to Anderson PowerPole, but I thought those green ones were heavy enough. Oh well. In a few days, I would have had a bigger failure as the connectors finally made contact with each other.