I retrieved 3 more AMs and the cards of 2 of them are broken. Only one of the two broken AMs ran out of power, another one had power left, but the card was still broken. An interesting thing is even the functional card can not be seen by AMs, although it can be seen on my pc. When I plug this card into an AM, it will start with a long red light and then both the green and red lights will start to flash quickly.