[Zope] Zope 2.5.0 unstable on RedHat?

Hi, I've installed Zope 2.5.0 on a RedHat 7.1 box I've also the following products: LocalFS, FSCounter and ZWiki (last versions). I've started Zope with the -Z option. Zope keeps in going down around every 24 hours. What is the matter? I mean, everything was going well with 2.4.3... Thanks for any help Mik