I allowed my Phantom 1 to drain its battery completely and it crashed from about 25 feet. The Phantom then sat unattended, but powered by the dying battery for 15-20 minutes while tried to get to it, further depleting the battery.After the crash, the motors fail to start correctly - they just turn in small jumping steps at about 20 RPM, but never start. They are running in the right directions, though. Any idea what happened and what I can do about it? YouTube of the malfunction here: http://youtu.be/KViW1UaFuTk