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Screen flickers when using Costum Viewer

Hi,

I'm currently building an AR/VR App for my Thesis. It's a simple scene to look around a 360° video and a Image Target to place a trackable object in the scene. 

As soon as the image target gets detected the screen starts flickering. This happens only in device type; Phone + Viewer. In the other two modes it works fine. But since I need to run it on a Phone thats a problem. See the attached gif to get an idea of whats happening. The flickering happens way faster than the gif is showing. And its regardless of the image target size or lighting conditions. 

I attached the DigitalEyeware Settings and XR Settings as well. 

Anyone got an idea why this is happening? 

Cheers!