Yeah. This has been happening on and off for the last couple months now. I would assume it's related to the increased graphics load from DX9, and the sheer number of people/objects in the zone.
Right now, there's not a whole lot you can do about it. I've found that slowing down when coming around corners and/or looking down will help avoid lockups. Obviously, that doesn't help when you are zoning in though. About the only other option you have is increasing your video ram (I have about a 2 year old card, and it's pretty noticable now). Other then that, you'll just have to wait until they fix whatever's causing it.
I've found you can usually just log right back in after it happens, so it's not that big of a deal.
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