[Zope] zope hangs after "a while"

http://news.gnome.org/gnome-news/ - the GNOME News site is up and running, thanks to help from list members. The only remaining obstacle between the site and a good slashdotting is the fact that after a period of operation, the server hangs (the same symptoms as when I overloaded 2.0.0b4 with requests). This period can be as short as 20-30 minutes, and I think averages around an hour. The site has received 20k page hits over the past 23.5 hours (I've got a script that restarts it every hour). I know this is very vague - if I can provide any specifics, please say so. -- Elliot The time for action is past! Now is the time for senseless bickering!