Hi aladedragon,
glxinfo looks like NVidia proprietary driver. Hardware accelleration is enabled. Seems to be a pretty old version of NVidia driver. In case you used the Debian standard installation method via package, it might be the newest you can get for Debian Squeeze. Consider upgrading to Wheezy. It has newer NVidia packages.
Sun Mar 17 22:40:25 2013, Received scale factor for effect crystal_casting that don't use param scaling
Sun Mar 17 22:40:28 2013, <src/client/psclientchar.cpp:540 HandleEffect SEVERE>
Sun Mar 17 22:40:28 2013, Failed to render effect spell_failure
Sun Mar 17 22:40:30 2013, <src/common/effects/pseffectmanager.cpp:309 RenderEffect SEVERE>
Sun Mar 17 22:40:30 2013, Received scale factor for effect crystal_casting that don't use param scaling
Sun Mar 17 22:40:33 2013, <src/common/effects/pseffectmanager.cpp:309 RenderEffect SEVERE>
Sun Mar 17 22:40:33 2013, Received scale factor for effect life_infusion that don't use param scaling
Sun Mar 17 22:41:43 2013, <src/client/psengine.cpp:1885 FatalError SEVERE>
Well, there seem to be some issue with rendering spell effects. And some other art related issues, but I think they do not explain the "crash" or sudden end.
But this does:
Sun Mar 17 22:41:43 2013, Server is not responding, try again in 5 minutes. Check http://planeshift.subhosting.net/ page for status.
Sun Mar 17 22:41:43 2013,
It means that either the server really does not respond or your connection to it is broke.
From all I can tell this is no crash at all. Just a lost connection.
I suggest you run with --console for some time and if you see a real crash post a link to a pastebin again.
Also include as much detail on your hardware and software configuration as you can. I know you use Debian Squeeze. What desktop environment? Is compositing enabled? And stuff like that.
If you always get only "Server not responding" in log, I think the issue is your ISP.
Good luck,
helios21