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Vuforia Unity model shaking

Hi,

I'm using Unity 5.5.2 and Vuforia 6.2.10 

I'm using Used Defined Targets to scan an image and display the model on top the image.

The scale of my UserDefinedTarget gameobject is (0.5f, 0.5f, 0.5f)

The scale of my Model is (0.3f, 0.3f, 0.3f)

The issue that I'm facing is, the model is not stable and keeps shaking even if I hold the device stable.

This is the link to the video.

https://drive.google.com/file/d/0B5keL9SgVCdjOTN3SC1sSXRtNXM/view?usp=sharing

Can anyone please tell me what is wrong with my current set up and why does the model keeps shaking.