[syslog-ng]Syslog-NG 1.6.6 memory leak when sending UDP logs

I'm running 1.6.6 on Linux Redhat ES 3.0 logging Cisco router logs to local files and it's been running just fine for over a week. I just enabled forwarding for local4 and local7 (with spoof UDP) to 2 additional hosts via UDP and noticed, within a day, that it syslog-NG has consumed all available memory. It continues to log, however, the system starts killing processes off unless I restart syslog-ng. I checked the list, it seems like the closest similar problem I could find was back in 2000. Any advice for fixing/identifying the problem?