clerick,
have you installed a bunch of updates/patches, since you initially installed the complete game download?
it could be something in your settings folder... you could backup your current settings folder, and move it to a safe location, then login to the game and let it regenerate the settings folder ( then afterwards you could copy & paste your stick settings and other important .cfg files )
or you if you indeed have done numerous patch overs, it might be a good idea to go ahead and to a complete fresh install of the game...... I prefer to do this after I go thru 6 to 8 updates max....... ( ALWAYS BACK UP YOUR DESIRED FOLDERS BEFORE HAND... uninstall then reinstall the newest game version )
it could also be something to do with your video , or your memory perhaps
just some suggestions...... good luck
TC