I downloaded the latest version of the Vuforia Ground Plane Sample (version 7.1.34 released Apr 20, 2018) and built it with Unity 2017.4.1f1 and Vuforia 7.0.50. I ran it on a Samsung S8 device. I could place the chair on the floor, but any other action resulted in the chair shaking and floating at random places in the air. Same with the astronaut. Could you help me identify the source of these problems?