I have a 3DR quad running 3.0.1 and am trying to figure out why it flips over and crashes well into a flight just about every other time I fly it. At first I thought it was due to vibration but I think I have that pretty much under control. My graphs of AccX, Y, and Z look good for the most part with X and Y +/- 1 and Z between -9 and -10. Just before it flips though the Z values start rising and go well above 0 as or just before it flips.
I'm at a loss as to what is making it flip and could use some advice regarding things to check. I had a helpful dialog with Gary McCray to address vibration issues but am not sure how to diagnose something like a loose connection or bad motor. What else would make it just flip and crash? The frame, battery, and motors are solid. I seems that the copter flips more often when it's hot out but that could also be because I fly more when it's warm. It seems to flip is stabilize, RTL and Alt hold.
I attached the most recent rlog, tlog, and log files. The crash occurs around 96% on the tlog. Any advice is appreciated. It's getting expensive keeping up with repairs.