Uncommanded Climb on Landing

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I have a Phantom 4 that has developed a strange quirk. When manually landing in normal mode, the aircraft will go into an uncommanded climb approx one foot from the ground climb two feet start responding to the controller's down command then repeat. It's already resulted with the aircraft striking the ground and overturning during a manual landing from the aircraft not responding. I've started using ATTI for takeoff and landings. Is this an issue with the sensors and should it be in the flight log? I can put it in a two foot hover and watch it go up and down on its own. Any help would be appreciated.
 

msinger

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Are you able to reproduce that behavior after disabling VPS?
 
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I didn't try to recreate with the VPS off. I updated to V01.02.0503 and the aircraft hasn't tried to climb yet. I ran the calibration while I was updating the firmware.
 

msinger

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Ah, well, that might have fixed it. In the latest P4 release notes, the following is listed in the "What's New" section:

"Reduced the occurrence of sudden altitude drop and mitigated the drop range during flight."
 

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