What Causes Repetitive Shutdown?

Hello, Please take a look at the log below and point out what might be the cause of this repetitive shutdown and configuration reload request. Thank you

    Dec  1 12:43:35 romeo notice syslog-ng[2957]: Configuration reload request received, reloading configuration; 
Dec  1 12:43:45 romeo notice logger: enter tmos mode
Dec  1 12:43:47 romeo notice logger: enter tmos mode
Dec  1 12:44:01 romeo notice syslog-ng[2957]: Configuration reload request received, reloading configuration; 
2015-12-01T12:49:01+01:00 romeo notice boot_marker : ---===[ HD1.1 - BIG-IP 11.2.1 Build 862.0 ]===---
Dec  1 12:49:02 romeo notice syslog-ng[2954]: syslog-ng starting up; version=\'2.0.8\'
Dec  1 12:49:37 romeo notice audispd: audispd initialized with q_depth=80 and 1 active plugins
Dec  1 12:49:46 romeo notice syslog-ng[2954]: Configuration reload request received, reloading configuration; 
Dec  1 12:49:55 romeo notice logger: enter tmos mode
Dec  1 12:49:57 romeo notice logger: enter tmos mode
Dec  1 12:50:12 romeo notice syslog-ng[2954]: Configuration reload request received, reloading configuration; 
2015-12-01T12:55:52+01:00 romeo notice boot_marker : ---===[ HD1.1 - BIG-IP 11.2.1 Build 862.0 ]===---
Dec  1 12:55:54 romeo notice syslog-ng[2956]: syslog-ng starting up; version=\'2.0.8\'
Dec  1 12:56:28 romeo notice audispd: audispd initialized with q_depth=80 and 1 active plugins
Dec  1 12:56:37 romeo notice syslog-ng[2956]: Configuration reload request received, reloading configuration; 
Dec  1 12:56:46 romeo notice logger: enter tmos mode
Dec  1 12:56:48 romeo notice logger: enter tmos mode
Dec  1 12:57:03 romeo notice syslog-ng[2956]: Configuration reload request received, reloading configuration; 
2015-12-01T13:01:38+01:00 romeo notice boot_marker : ---===[ HD1.1 - BIG-IP 11.2.1 Build 862.0 ]===---
Dec  1 13:01:39 romeo notice syslog-ng[2959]: syslog-ng starting up; version=\'2.0.8\'
Dec  1 13:02:13 romeo notice audispd: audispd initialized with q_depth=80 and 1 active plugins
Dec  1 13:02:23 romeo notice syslog-ng[2959]: Configuration reload request received, reloading configuration; 
Dec  1 13:02:32 romeo notice logger: enter tmos mode
Dec  1 13:02:33 romeo notice logger: enter tmos mode
Dec  1 13:02:46 romeo notice syslog-ng[2959]: Configuration reload request received, reloading configuration;