Hi! My first guess when I look at the traceback is that the problem actually seems to be Core Session Tracking:
2002-01-30 11:04:11.323557500 File /web/Zope-2.4.3/lib/python/Products/CoreSessionTracking/SessionStora ge.py, line 186, in store 2002-01-30 11:04:11.323561500 (Object: SessionStorage) 2002-01-30 11:04:11.323562500 ConflictError: ('\x03B`|"\xd2\x85\xbb', '\x03B`|+"\xdf*')
A conflict error on its own just shows that you have a lot of load to handle. So this should not kill the Zope process. But in my experience, CST never worked without problems. Load errors and conflicts happened rather frequently. I'd suggest upgrading to 2.5 and the new session stuff soon, though this might also cause new problems on other parts of the site, and certainly can not be done over night ... Joachim