[syslog-ng] Log rotate problem

Hi! I use syslog-ng to log all incomming pckts in a named pipe. Then I run a script to parse all the information I need. The problem is that a couple of minutes after 6.00 the process stops. I know the problem is not in my script, so I decided it could be a cron job that restarts the syslog-ng daemon. But in cron.daily I saw only sysklogd. How does this communicates with syslog-ng so that the whole process restarts? Has anyone idea how to fix that problem? cheers Dian