3d Model freezing up

I have a 3d model in AutoCAD 2014 and everytime I try to manipulate it, open it etcc.. it locks up and most times I have to restart AutoCAD. If I can get it into wire frame it seems to work ok, but switching from realistic to wire frame always causes it to crash as well. I have changed the recomended settings from Autodesk but it doesnt seem to help at all.

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