Mine freezes for about 20-30 seconds, and then tells me i have disconnected, which puts me back to the character screen (at which point party invites start giving me wierd errors, probably due to my client thinking i'm still in the party when i'm not, and so i re-log).
However, once the freeze ends, before clicking "ok" to the disconnect message, i can still see the game running fine again in the background, which leads me to believe the disconnect is due to a lack of response from my client due to the freeze, and the server is forced to conclude i disconnected.
While frozen, the entire OS becomes unresponsive and i cannot even ctrl+alt+delete (however, any music playing in the background will continue to play).
Other than this freeze, the game runs fine for me, GPU doesn't overheat or anything (my settings are all low, max 30 fps).
Edit: This problem has only started appearing after 1.0.3(b, i think), it didn't happen a single time before that. Now it happens on average once per hour or so (usually around the time i've built up 5 NV stacks ><).
I'm on Windows Visa 64 bit, GeForce 260 with latest drivers (updated today).
Edited by Dragonfly#1941 on 7/18/2012 7:37 PM PDT