2.4G Datalink Auto Land failure

I was on my last flight of the day when I performed the auto land function via ipad and DJI 2.4G datalink. The MR landed ok but failed to power off the motors. I switched into Atti mode to take over control and performed the ESC function to power it off. Instead it flipped over and continued to run, i attempted to perform the esc again and put it in and out of GPS and atti modes to no effect. I had to pull the batteries to stop it. Luckily there was no real damage. However I am left wondering why this occurred. I had already performed the auto land function without any issues during that flight as well as previous flights that afternoon. I have the flight log from the iosd if anyone can interpret it.
 

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