Unexplained EKF failure

I posted this in another group and thought this might be a better fit.

I took my pixhawk for it's first flight and performed fantastic until, for some reason, EKF_CHECK-2 error occurred causing hard forward thrust. I need help analyzing the attached log. I spent the first few days learning the log utility in Mission Planner and reviewing the log and am blown away as to how much information it logs. Very impressive. But when the EKF_CHECK-2 occurred, it did a hard forward on it's own then i threw it in to RTL. The second time it occurred (same flight), it nose dived in to the ground (luckily. better than flying away.) gps was spot-on for the duration from what the logs says. I just can't wrap my head around the EKF failures and how I should interpret and what I should do. Logs attached.

Much appreciated in advanced.

p.s. I tried to post this in the "help me with this crash" forum.  I hope I made it.

2015-06-28 09-42-44.zip

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