[Zope] zope 2.9.6 stops servicing requests

[Chris Hoy]

Hi

Several weeks ago I moved one of my machine to a new server and upgraded
zope from 2.7 to 2.9 as well as the database from mysql 4.1 to 5.0.38.
All seems to be going well expect that on a couple of occasions the zope
server has stop repsonding to request. The server is takeing 0% cpu and the
only way to get it going again is to re-start zope.
I can't see anything in the event.log file or on the machine (the debug info
is below)

Can anybody point me in the right direction to try and find out what is
happening 

# Zope version: (Zope 2.9.6-final, python 2.4.4, linux2)
# Python version: 2.4.4 (#2, Apr 12 2007, 21:22:23) [GCC 4.1.2 (Ubuntu
4.1.2-0ubuntu4)]
# System Platform: linux2
# SOFTWARE_HOME: /usr/lib/zope2.9/lib/python
# INSTANCE_HOME: /home/zope/instance
# CLIENT_HOME: /home/zope/instance/var
# Process ID: 31605 (1140881728)
# Running for: 13 min 15 sec
# sys.path:
  /home/zope/instance/Products/Hnd
  /home/zope/instance/lib/python
  /home/zope/instance/lib/python
  /usr/lib/zope2.9/lib/python/Zope2/Startup
  /usr/lib/python2.4/site-packages/setuptools-0.6c6-py2.4.egg
  /usr/lib/python2.4/site-packages/simplejson-1.7.1-py2.4.egg
  /usr/lib/zope2.9/lib/python
  /home/zope/instance
  /usr/lib/python24.zip
  /usr/lib/python2.4
  /usr/lib/python2.4/plat-linux2
  /usr/lib/python2.4/lib-tk
  /usr/lib/python2.4/lib-dynload
  /usr/local/lib/python2.4/site-packages
  /usr/lib/python2.4/site-packages
  /usr/lib/python2.4/site-packages/PIL 


Chris