I need help understanding a recent crash. Basic info:

• Matrice 100, DJI Go, iOS
• 5-10mph wind
• RTH altitude 197 ft
• Flying in Atti mode
• Switch to P-GPS mode for landing (at 284ft AGL, 20% battery)
• UAV goes into rapid (30mph) counterclockwise arc
• UAV not responsive to pilot input (though 100% RC signal)
• Switch back to Atti to land - UAV seems to be flying normally
• At 10% battery mode auto-switches to AutoLanding
• UAV goes into rapid counterclockwise arc again (appears to be same behavior as above when switched to P-GPS - but this time low to ground because I was close to landing), not responding to pilot inputs
• 21 seconds after mode switched to AutoLanding UAV has crashed at 30mph, 8% battery, 248ft horizontal from home point (no injuries, but siginificant UAV damage)
• Flight log seems to have accurate record of locations, elevations, speeds, pilot inputs, etc. for entire flight
  

Errors seen in log:

• "Warning:In Flight, working encounters bias large" (x3) - what does this one mean? I didn't notice it on screen during flight - seems to pop up and then go away quickly and I am usually watching the UAV when flying in Atti mode.
• Not Enough Force/ESC Error (many)
  

Some specific questions:

• Is there a way to (quickly) override AutoLanding once it has initiated?  
• Has anyone heard of this counter-clockwise looping flight previously? What would cause UAV to do that?
• Why would UAV in AutoLanding mode do anything other than come straight down?
  

Thank you for any help!

I need help understanding a recent crash. Basic info:

• Matrice 100, DJI Go, iOS
• 5-10mph wind
• RTH altitude 197 ft
• Flying in Atti mode
• Switch to P-GPS mode for landing (at 284ft AGL, 20% battery)
• UAV goes into rapid (30mph) counterclockwise arc
• UAV not responsive to pilot input (though 100% RC signal)
• Switch back to Atti to land - UAV seems to be flying normally
• At 10% battery mode auto-switches to AutoLanding
• UAV goes into rapid counterclockwise arc again (appears to be same behavior as above when switched to P-GPS - but this time low to ground because I was close to landing), not responding to pilot inputs
• 21 seconds after mode switched to AutoLanding UAV has crashed at 30mph, 8% battery, 248ft horizontal from home point (no injuries, but siginificant UAV damage)
• Flight log seems to have accurate record of locations, elevations, speeds, pilot inputs, etc. for entire flight
  

Errors seen in log:

• "Warning:In Flight, working encounters bias large" (x3) - what does this one mean? I didn't notice it on screen during flight - seems to pop up and then go away quickly and I am usually watching the UAV when flying in Atti mode.
• Not Enough Force/ESC Error (many)
  

Some specific questions:

• Is there a way to (quickly) override AutoLanding once it has initiated?  
• Has anyone heard of this counter-clockwise looping flight previously? What would cause UAV to do that?
• Why would UAV in AutoLanding mode do anything other than come straight down?
  

Thank you for any help!