We have never faced this in the many boards we tested in lab. I would suspect a weak solder joint somewhere, or some issue with this board which went undetected.

@Morblias: You could send this board for replacement. Please let me know if you do so and when so I can accelerate the process and also see what's wrong with this board.
However, if you have the possibility of testing this card on another computer, it would be very helpful, as the issue may come from the actual computer / driver that you're using.

Thanks,
Nasser