Need some advice ! .....

3.0.1 amp 2.5

had problems this evening .... was in loiter, moving it around a bit and then letting it hold position ...no problems, I then switched to circle mode quad banked left and kept banking left I switched to loiter then to stab mode ... but no response quad flipped upside down and went down in corn field.... only at 10 -15 feet so no damage ....but I would appreciate some one pointing me in the right direction to sorting this out !

I had  been flying around and testing loiter/circle earlier without any problems ... (i was just trying to get trim sorted)

Thanks

A

2013-08-08 18-14-46.tlog

2013-08-08 18-14-46.rlog