I had a strange but, thankfully, short occurrence the other day. I have hesitated to report it because I'm not entirely sure what happened. However, I just read of a power failure in another thread so I thought I'd post my impressions at least. I was in a fairly fast, deliberate descent when it began to descend uncontrollably - it would not respond to throttle. It was also at that second, I think (not sure), that the recorder on the camera stopped and that I hit the first battery level warning level, whatever that is. I don't think power was ever lost, but it seemed power-related. Thankfully, it responded to throttle before meeting ground. My very rough theory is that it was a power issue which may or may not have been related to fast descent and the battery getting to the first warning level. Beyond that I don't know.