[syslog-ng]restarting syslog-ng

Hi, When I restart syslog-ng, should I be restarting all other applications that write to the log files? I have noticed that when I restart syslog-ng (/etc/init.d/syslog restart - redhat 7) I will lose certain messages to my maillog from sendmail. If I don't restart my cron daemon, it no longer has any new messages in its log file (/var/log/cron). This is true of other apps as well. The stopping/restarting of syslog-ng is handled by redhat's "daemon syslog-ng" and "killproc syslog-ng" scripts within /etc/init.d/syslog.