[Zope] Is Zope 2.6.3 stable?

Hello, Since I installed Zope 2.6.3 on our test-server it has become extremely unstable. I get I/O-errors all the time and the server dies at least once a day. This did not happen with Zope 2.6.2. We're running it on Python 2.2.3. And, as always, there are no useful information whatsoever in any error-logs, which I find rather frustrating. Does anybody know if 2.6.2 is in fact more stable than 2.6.3? Or is it possible than one of our Plone-products is causing the server to kill itself? (It usually die when no-one is using it.) -Petter-