Stick objects when camera cover up

I have an app created with unity 2017.4.6f1 and using arcore v1.6.

I placed some object to scene by static coordinate (coordinates don`t changing). When user cover up camera by chance or camera located near some objects (wall, table etc.) - i get "frozen" scene. (Scene moving with device (Objects sticked to camera))

How this problem can be solved? Maybe you have some idea or solution?

If you need more details, feel free to ask.

 

I think this happens when your app loses tracking and it doesn't know where it is in the scene anymore, so it resets to it's origin. I don't think AR will have a way to get passed a user covering up the camera due to the way it works. Could you record a video of it happening?