Hi Gents,
I’ve just turned on wireframe in CVD, and this is what I have:
This is super, super complicated for a physics mesh - there could be all sorts going on with accuracy errors, and ordering in construction which can cause divergence. I’d recommend you simplify this down and create a very simple convex hull. There are also random unconnected bits of geometry as well. The wheels have brake calipers in the physics mesh as well and should really only need to be a cylinder for the phyiscs.
This is highly likely to be the cause of the issues we are seeing. If you can redo this geometry, make it super simple and retry the test it could solve the issue.
All the best
Geoff