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I was doing a quick test flight after a rebuild (crash due to lost signal and failsafe not setup) and all seemed well.  I was at the end of about a 5 min flight where I was going into and out of Loiter and Alt Hold and had just come out of Alt hold into stabilize.  I started moving around again and suddenly from about 6' up it did a double back flip and into the ground.

As soon as it started flipping I reduced the throttle to 0 but it didn't respond, and even after it hit the ground the motors were still trying to spin.  I had just setup the failsafe to RTL if signal was lost but even if I got bad signal it shouldn't have been able to do a backflip in Stabilize.

I am trying to look at the logs to try and determine what happened but it almost looks like its not logging the input signal for some reason.  Here is the last bit of the log from the crash.