[Zope] Zope instance restarting itself

[Gitte Wange]

Hello,

I have a Zope-2.6.1 instance running which behaves very weird. It 
restarts itself :-(
First I discovered that the Data.fs truncated and restarted Zope. I then 
used fsrecovery.py on the Data.fs and it removed a bad transaction.
Then I started Zope with the new Data.fs file.
Now the instans restarts at the same time but without the error - infact 
withput any error.
Any hints on how I can debug this?

Greetings,
Gitte Wange