It mostly happens when I'm in Gridania.
I'll be walking around when the game suddenly freezes for a bit. It then comes back but all the textures are messed up. This gets really annoying as it also messes up the text, colors, models, etc. It renders the game unplayable.
I'm getting tired of having to restart the client every time as it makes me lose my leve that I'm on.

I have the newest drivers for my GT 240, 8 GB of ram, and an i5 cpu