[Zope] zope 2.3 instability

[jose]

Hi all,
I have a problem of stability with my Zope.
seems that every time zope sends the following line to debug.log:
    <timestamp>: PROBLEM(100) ZServer unhandled connect event.
Zope goes in loop, sucks all the available memory and goes down.
Some times zope crash my Linux with the message:
kernel:VM: do_try_to_free_pages failed for kswapd.
I'm thinking to  return back to the Zope previous release.

Any ideas?
Thank you to all.
José