Shaky stacked blocks in ARKit

Hello,

I am developing an augmented reality game with the help of ARKit.

I code in Swift 5 on Xcode 10.2.1.

I am developing on a MacBook Air equipped with MacOS Mojave 10.14.5.

The application is launched from an IPad Air 3 equipped with IOS 12.3.1.


The problem appears after the map is placed. The stacked blocks move by themselves and fall off the playing field.


Here is a folder containing a video and images showing the problem.

https://transferxl.com/08jHjxfWpQzgGB


Thank you and have a good day.