[kubuntu] Failure to sleep and xsession crashing

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http://ubuntuforums.org – After running for a few days, my KDE/Kubuntu session is crashing when I try to sleep. I shut my screen, and (a) the laptop won't go to sleep, (b) when I open my lid, I get the login screen, and switching to the text-only terminals (Ctrl-Alt-F2) just gives me a blank screen. I've attached the syslog of the most recent failure, at Aug 29 01:42. There was a successful sleep at Aug 28 09:33 in the same log. The logs appear the same, until these pulseaudio errors. Code: Aug 29 01:42:23 envy kernel: [169553.070258] PM: Preparing system for mem sleep Aug 29 01:43:09 envy pulseaudio[404 (Hardware)