Thanks for the reply man. The smooth is on top but it just kept on doing it all night. I replaced it with others yet they still did it so if the mesh is getting corrupt it must of been something with the mesh. Anyways, this morning, put the smooth back on, and its fine. It plays back etc great. Problem is, if im rendering and it decides to do it i have to fine the frame it did it on and replace it

.. but i can live with that. Weird.