I often get this as well. A tiny little me (or maybe it's just a small part of me) takes off while the camera stays in place. I can manuever the tiny me, until i can no longer see me (I've always forgotten [until now, after reading this thread] to use the Mini-map to continue controlling the tiny me). I also have trouble loading assets, sometimes, in areas, but they eventually load. I had the same issue in the Demos, though not as often.