Services (apache, postfix...) on CentOS 6.5 restarting some times each day. How can i found out the reason?

The Server is an CentOS 6.5 with Plesk 11.5.30 (Update 51). The machine hasn´t to do much. There are only some donains on it and that s it. We have installed watchdog to monitor the services.
We receive each 3-4 times mails from watchdog that says, that services like apache or postfix wer stopped and 15 Minutes after we receive the "Services has started" mail.
I don´t know were to look at to find out the problem or reason.

May you have an hint for me ?

Thanks in advance.
loosainAsked:
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savoneCommented:
For apache, the default log location is:

/var/log/httpd/

For postfix the default log location is:

/var/log/maillog

Basic syslog might be of some help too:
/var/log/messages
Steve BinkCommented:
If you're on Plesk, there may be an automated scheduler doing this.
loosainAuthor Commented:
It is not happening always at the same time. I didn´t found any cronjobs except of backups and some cleanup-jobs. But all of them are not running while those restarts happens.
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Steve BinkCommented:
Go back to savone's comment and start checking the logs.  The spontaneous restart could indicate a stability issue on your server.  You should also check Plesk's logs to see if it caught anything....Plesk embeds itself pretty heavily into the server and takes over a lot of things.  Troubleshooting the issue through Plesk is never a good time.

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loosainAuthor Commented:
I found out, that it wasn´t a service that stopped. Watchdog thought there was no service and sent me a mail. But there still was the service running. i disabled watchdog and now it seems to work fine.
Steve BinkCommented:
Just remember that disabling an error-reporting service does not resolve the error - it just makes it so you don't know the error is occurring.  Good luck!
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