Sometimes my sites go off

it has happened a couple of times, most recently yesterday.

Going to visit my sites is the warning impossible to get to the site or server has not responded.

Entering cwp everything is normal. All active services, no error or visible problem.

Restarting the server via ssh, the sites back online and everything is back to work.

What can it be? there is a way to understand what has happened?
Whereas I had to disable some logs because they ate all the space ...

Hello.

Once it happen again try checking Apache logs ( /usr/local/apache/logs/error_log ) it could be show you the reason.

Sometimes this:

[Thu Aug 04 23:19:25 2016] [notice] caught SIGTERM, shutting down
[Thu Aug 04 23:19:58 2016] [warn] Init: Session Cache is not configured [hint: SSLSessionCache]
[Thu Aug 04 23:19:58 2016] [notice] suEXEC mechanism enabled (wrapper: /usr/local/apache/bin/suexec)
[Thu Aug 04 23:19:59 2016] [notice] mod_antiloris 0.4 started
[Thu Aug 04 23:19:59 2016] [notice] Apache/2.2.31 (Unix) mod_ssl/2.2.31 OpenSSL/1.0.1e-fips configured -- resuming normal operations

but it can be the cause?

These messages are not an error, just notice

I have had similar issue next time as test just stop and started BIND and see if starts working again.