caught SIGTERM, shutting down

Hey List,

 We have Jboss clustered environment with Apache installed on the main
 server. For the past few days I've observerd Apache web server going
 down couple of times in a week and hence users were not able to login.
 I had to restart Apache. I checked the logs and in error_log I found
 the following. Kindly help

 [Mon Apr 23 14:49:37 2007] [notice] caught SIGTERM, shutting down
 [Mon Apr 23 14:49:48 2007] [notice] suEXEC mechanism enabled (wrapper:
 /usr/sbin/suexec)
 [Mon Apr 23 14:49:48 2007] [notice] Digest: generating secret for
 digest authentication ...
 [Mon Apr 23 14:49:48 2007] [notice] Digest: done
 [Mon Apr 23 14:49:49 2007] [notice] mod_python: Creating 4 session
 mutexes based on 150 max processes and 0 max threads.
 [Mon Apr 23 14:49:49 2007] [notice] Apache/2.0.52 (Red Hat) configured
 -- resuming normal operations

 Thanks in advance
 Sreedhar