Vuforia tracking unstable

Hi

acording to documentation Vuforia should shut down itself after a marker was recognized. THis is from the doc.

1. Vuforia’s target Tracker recognizes the target
2.     Target tracking is then initialized
3.     The position and rotation of the target are analyzed to provide a robust pose estimate for HoloLens to use
4.     Vuforia transforms the target's pose into the HoloLens spatial mapping coordinate space
5.     HoloLens takes over tracking and the Vuforia tracker is deactivated

I could verify this by printing out a log message in the OnTrackingFound() callback. Vuforia stays disabled as long as i dont move my head too much.

Unfortunately it re-enables itself when the head movement is large, producing new OnTrackingFound() events and adjusting the position of the object producing jumps. Only if the marker image is removes fast enough Hololens takes completely over and provides smooth tacking. 

https://drive.google.com/open?id=0B8IelTNR8ZZ3X3JZMVk0WVNMY1U

Do you see the same behaviour? Why does Vuforia re-enable itself if the marker is not moving.

Ideally i would disable an imagebehaviour tracking completely after the first time a marker was found.

Thanks

Dimi