I installed mine on the hard drive and didnt seem to have major problems! I did notice a bit of jumping when it autosaved but thats about it. So i cant really comment on the problem you are having (i did however have texture bugs which emerged after a while)I have been on my 360 but it seems like I need to occasionally delete the game and reinstall to fix bugs. Once I reinstall it it seems to run smoothly for a while and then mucks up a week or two later. So now I'm trying it without the game on the hard-drive. What do you guys do?