I am experiencing a new issue which occurs randomly that brings my fps down to around 5 fps (compared to the normal 30). When this happens the screen will flicker briefly which is followed by the low fps and also objects rendering incorrectly. When I am inside a building when this happens, all of the walls and objects inside of the building turn invisible so I have a difficult time navigating (not that 5 fps is playable). I have figured out that enabling or disabling vsync (whichever it is not currently set to) will cause the game to reload everything and it is back to normal. I have not gone longer than 5 minutes without this happening. I have attached a screen shot of what the inside of a building looks like after everything turns invisible.. (notice it is raining inside of that building as well)