Working on an sizeable assembly for a Solar Car suspension. When I orbit around the model, faces disappear and I cannot click on anything when this happens. I seem to have to open and close the pad tool repeatedly for something to magically happen and it works again. But this is basically grinding my workflow to a halt. Changing view modes does nothing and opening engineering connections just makes everything disappear. 

https://drive.google.com/file/d/14N5hhWi6EMcsKU6y3Ta_xDkK58IlSDNe/view?usp=sharing