This has happened to me a handful of times during many years of use, but I don't think it has ever happened during a recording--only during setup. IIRC it happened at least once when my microphones weren't connected yet.
I seem to recall as well that there was one time when both overload LEDs came on as soon as I powered up the unit (with nothing else connected yet), and that they wouldn't clear when the button was pressed, which did alarm me. But disconnecting the unit from power for a minute solved that problem (again if I recall correctly--otherwise I would have sent the unit in for service right away--but I'm pretty sure that the only time I've ever sent it in was to fix the absolute polarity problem).
Since none of the other LEDs came on (at least while I was looking), it seemed to be a behavior of the LED display logic itself, perhaps a delayed artifact of turning the unit on. If so, that's something I can live with. I haven't heard any spurious noises in the audio, nor seen any unexplained full-scale peaks in the wave audio files. Has the original poster?