[Zope] Zope crashing after movin Plone site to RHEL 4

Hi, I have this 1.0.2 Plone site running for about two years, or so. It always ran smoothly. Recently, i've moved it to a new server running Red Hat Enterprise Linux 4. I've compiled Python 2.1.3 and start Zope with: exec /usr/local/python-2.1.3/bin/python $cwd/z2.py -L 'pt_PT' -u zope "$@" Now, i'm having this big problem: Zope crashes every day once or twice. Onle restoring a previous Zope backup i can get Zope and Plone up again. Is there something wrong here ? Something specific to RHEL 4 ? Thank you in advance. Warm Regards, Mário Gamito