My Atrix (not the Atrix 2) has started shutting down at various time without command. This happens mostly after playing music from the SD card, but also happens after a long call. The phone was replaced along with new SD card and new Sim card, total reset and reload of music - still persist. One rep at the warranty center said that an update was due out very soon. Does anyone know of the UPDATE? He also said that it was being released in Beta to select users - any idea of that?