[BrianG]

As far as I know, ALL switching BECs can fail in this way. Unless DE put some kind of catastrophic circuit in that measures the output and breaks the connection if found, it too can do the same thing. However, DE makes good stuff, so even if the circuit is basically the same as any other BEC, the choice of support components, layout, etc can have a dramatic impact on reliability. And the Koolflight one I was using was not a cheapie; this is the first one I've had that failed. I just think that when one of the motor wires came loose, some very high back-EMF voltage was generated and overvolted the input of the BEC.