Was driving around and all of a sudden this weird glitch happened that made the fps drop. Once I re-logged, it was gone. Is this a game bug, or something hardware related?
I've been having some strange gfx glitches since this last patch too, everything but terrain disappears.
Restarting the client seems to fix it though. http://www.youtube.com/watch?v=p85xwZ_OLX0
That right there is grade A artifacts from your graphics card. Generally things like this happen depending on the circumstances. Dust can sometimes be a culprit as well as a dying gfx card. Depends on the situation.