Handling tracking-loss of Ground Plane

I'm using groud plane on galaxy s7, and after walking around in the room, or just turning too fast with my phone away from the stage will cause it to loose tracking at some point.
And when that happens, the game becomes unplayable.
The stage is attached statically to the camera from that point on.

How can I detect that situation and what should I do about it?

 

Happened to me too... It seems that after pausing the app(minimize?) and getting back, it's starting to track again...
I think it's related to SmartTerrain, maybe there's a way to check if it was lost and initializing it again

 

Not just when switching the app to background. Also when moving my phone too far from the stage.

The question is how to detect loss of tracking for ground plane? I assume it's not "lost" like with image targets... its just buggy.

 

I think I didn't explain myself correctly:
It happens to me too when I'm moving too fast.
When I switch the app to the background and going back it works again.

Looking at the implementation of it, it uses the SmartTerrain.
I tried to use DeviceTrackerARController.Instance.RegisterDevicePoseStatusChangedCallback
And Stop+Start the SmartTerrain if TrackableBehaviour.Status isn't tracked/detected/extended... But it didn't work.

 

Maybe we can detect if the stage changed position by more than x,y,z and than auto-pause the game and initialize Vuforia + require the user to tap again on the ground ..

Would be helpful if someone from the team gave instructions on how to officially handle this.

 

Also looking for a solution for this issue!

 

Up up we go. Any comment from Vuforia? Thanks
@Vuforia-Strasza