Arducopter sudden flips in Auto

Hello guys 
Today was a very nice, so I took the Arducopter to test fly it. Unfortunately Arducopter crashed from an altitude of 25 m. The damage was not much, and I should be able to repair it to fly again.
I was flying in stabilize mode and the GPS reported 11 sat and a HDOP of approx 1.7, when I turned on the auto and it flew to its first waypoint of an altitude of 25 m, when it suddenly flips over and crashes.
I have no idea what happened at that time as it never happened before. 
I have attached the LOG file and hope someone can give an idea of what caused the crash.

2015-07-04 18-47-51.log

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