Hi Cricky,

In the "Preference Section" → "Real Time Render Options" Is "TAA" (Temporal Anti-aliasing) ON in this case ? If it was on, does turning OFF helps ?
Does this material has any Displacement map or Normal map ? If so, does flicker happen if they are removed ?

It seems that the PhysX bounding wireframe is too close to the original mesh, but I am not quite sure.
Could you provide the simple project that could repeat this issue ?
And also the Microsoft DirectX Diagnosis info may help

To get the DxDiag file:
1. Select the "Start" menu, click "run" or press <Win Key> + <R>.
2. Input "dxdiag" & click "ok".
3. It will check your system for a while, after finish, click "save all information".
4. Save "DxDiag.txt".

You can use cloud services such as Google Drive, Dropbox or OneDrive to make the files available to us and email the link with "FT3433" in the email title to feedbacktrackeradmin@reallusion.com. (or weienchen@reallusion.com)

Thanks