Strange behavior ended in crash

Hi … I write from Argentina to tell my experience. For several months I have been flying my hexacopter successfully with apm 2.5 board. Very accurate loiter mode, alt hold, and excellent the rtl. The plate is located in a casing of epoxy barometric sensor covered with foam rubber. I’m running version 3.01 of arducopter, and until today, was a happy user of this system. This afternoon, after making two flights in which I was testing my new gimbal brushless, and after eating a rich barbecue with friends flying club, try out again with my hexacopter. The first thing I noticed was that the engines accelerated much more than usual, and when I wanted to raise, the hexa, he lay sideways or forward, so I decided, disconnect the battery and reconnect. The gps status lights and armed, were solid once plucked the hexa, I try again to lift, and this time normally rises, after trying for a few seconds hold alt modes, and then loiter, way back hexa stable, and while I was in hover a few meters out scared me … forward. On this first occasion, nothing broke. Try later, and after reviewing everything ok find, and I get the same thing when I go to take off, start the engine with much more power than usual, and reeling for either side, when I look at the mission planer I see that after the engines were assembled, the artificial horizon, was completely twisted …! Disconnect the lipo, and I reconnect … everything ok, I check again the mission planer … everything ok … and lift the hex … a few seconds and doing a hover … scared out ahead again breakin … this time an arm of hexa (F550 frame). Really I am totally baffled by what happened, and so far, never had any problems. Someone can guide me to find out where you can be my problem …
From already thank you very much …

accompanying the flight tlog [attachment=0]17/08/2013 16-51-44.zip[/attachment]

mfstieb,
If you have a dataflash log that would be much better to help determine the cause. Also have you seen this page regarding finding the cause of the most common issues?

@mfstieb,
You might also want to post your issue on our sister website: diydrones.com/forum/topics/arduc … 1-released
Regards,
TCIII Admin

Thank you very much for your answers. I posted my problem also in another site, and I also have referenced the web to diagnose common problems with the logs.
My knowledge in this area are scarce, to give you an idea I’m a lawyer, so I understand what I can only read about apm, and logs information confuses me a lot, do not even know where to start looking for the problem.
I attached the log of the flight, I had no RAW enabled, so the information is basic to my understanding.
Thank you very much for your answers …!

[attachment=0]20130819214844.rar[/attachment]