It obviously did not lose its battery since it continued to transmit telemetry. It also doesn't look like it lost a prop - the onset of the problem was too gradual, starting with an uncommanded yaw to the left at 245 seconds. The first full rotation took nearly 8 seconds, after which the uncontrolled pitch and roll excursions started, with an overall frequency of approximately 1 Hz. That was also the point at which the aircraft began to lose altitude. Really do need the DAT file to figure this one out, I think.