Arduplane RTL crash Skywalker X8 plane.

I had a crash flying a big wing (Skywalker x8), when I hit the RTL switch, the plane started to pitch/roll wildly and crashed. The plane was flying at 30 meters, and the RTL altitude was set to 100 meters. I have posted the log. If anyone is able to decipher it, I would appreciate it. I cannot trace any mechanical failure yet. I suspect the plane stalled, but I do not know why. If anybody can analyze this log and give me a hint, I would appreciate it. The max climb rate was set to 5m/s. Possibly the plane was flying too slow when it tried to turn home and it lost airspeed. 

2015-12-21 16-49-00.bin

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