No. This signal is emitted when the scene graph has been invalidated.
This signal implies that the opengl rendering context used has been invalidated and all user resources tied to that context should be released.
The signal just informs you that the scene graph has been invalidated and that the OpenGL context has been released.
Have a look at this page. [doc-snapshot.qt-project.org]. If the context is temporarily not needed, such as when the application is not rendering, it can be useful to call destroy() to free resources. However, if you do so you will need to call create() again before the context can be used, and you might need to recreate any OpenGL resources and reinitialize the OpenGL state. You can connect to the aboutToBeDestroyed() signal to clean up any resources that have been allocated with different ownership from the QOpenGLContext itself.
Have you confirmed that this is in fact your problem. Have you checked that this signal is being emitted? If not then my suggestions might not be so helpful.
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