[Zope] Zope 2.4.3 crashing continually

I'm having continual crashing problems with Zope 2.4.3 running on Solaris. I first noticed it when loading the management interface would sometimes give error pages in one or more of the frames. Checking the Control Panel, the uptime would be under a minute; the server had crashed and the zdaemon had restarted it. Has anyone else seen this sort of problem? I turned on the error log, and it shows that the server is going down fairly often, sometimes several times per hour, with an Aiieee and an error code of 256. I was reading somewhere that that indicates that some Product had exited. The only non-distribution product I have installed is the latest DCOracle2; might that be causing it?