What version of AMP was your server running? This may be the symptom of a larger issue.
Check the server health:
-disk space (is the / volume full?)
# df -h
-memory (is the server hitting swap?)
# top -c
-amp disabled? (if this file exists, it means AMP disabled itself)
# ls /etc/amp_disabled
Other files worth checking:
/var/log/low_level_service_watcher
/var/log/service_watcher
/var/log/httpd/error_log
If nothing obvious stands out, then please open a support case. Support techs should be able to start a web meeting to diagnose the issue quickly.