[syslog-ng]Syslog-ng makes my server crash.

Hi all, Some quite strange things have happened in my network since i set up my syslog-ng as a log centralizer... Actually, when launched, my syslog-ng ends up to grab all resources of the machine on which it's installed. Then, no way to ssh to it... It's really strange cause normally, syslog-ng should use only very few resources... like syslog ! Whereas with syslog, everything goes well.. Don't know what's happening. Could somebody help me ? -- Yan DENET