cPanel keeps crashing

Hey guys,

I am facing a problem at the moment. I am using cPanel/WHM on a VPS Machine with 4x2,66GHz and 6GB Memory. But the Server keeps crashing every two to three days! I have about 20 customers on this machine, which shouldn't be too much normally, right ?!

As Installation I used the CentOS Version of cPanel.

I always get an E-Mail "chkservd HANG" and short after that, the server crashed. As a List of the Top Processes I get:

PID Owner CPU % Memory % Command
19983 afundgrube 35.79 0.16 php spread.txt
19978 afundgrube 9.03 0.21 php spread.txt
19069 afundgrube 8.71 0.30 /usr/sbin/iptables
19536 root 8.54 0.30 /usr/local/cpanel/scripts/restartsrv_spamd --restart --attempt 1
19564 afundgrube 6.77 0.10 php spread.txt

And also following logs:
cpanel_chkservd_log_tail.txt:

Code:

[2016-03-21 19:52:32 +0100] Disk check .... /tmp (/var/tmp) [8.51%] ... /dev/mapper/vg_cpanel1-lv_root (/) [30.72%] ... /usr/tmpDSK (/tmp) [8.51%] ... /dev/mapper/vg_cpanel1-lv_home (/home) [26.92%] ... /dev/sda1 (/boot) [15.14%] ... {status:eek:k} ... Done
Loading services .....clamd....cpanel_php_fpm....cpanellogd....cpsrvd....exim....ftpd....httpd....imap....mailman....mysql....named....nscd....pop....queueprocd....spamd....sshd..Done
Service Check Started
Service Check Finished
[2016-03-21 19:47:31 +0100] Service check ....sshd [[check command:+][socket connect:N/A]]...spamd [[check command:+][socket connect:N/A]]...queueprocd [[check command:+][socket connect:N/A]]...pop [[check command:+][socket connect:+]]...p0f [[check command:N/A][socket connect:N/A]]...nscd [[check command:+][socket connect:N/A]]...named [[check command:+][socket connect:N/A]]...mysql [[check command:+][socket connect:N/A]]...mailman [[check command:+][socket connect:N/A]]...imap [[socket_service_auth:1][check command:+][socket connect:+]]...httpd [[check command:N/A][socket connect:+]]...ftpd [[socket_service_auth:1][check command:+][socket connect:+]]...exim [[check command:+][socket connect:+]]...dnsadmin [[check command:N/A][socket connect:N/A]]...cpsrvd [[http_service_auth:1][check command:N/A][socket connect:+]]...cphulkd [[check command:N/A][socket connect:N/A]]...cpgreylistd [[check command:N/A][socket connect:N/A]]...cpanellogd [[check command:+][socket connect:N/A]]...cpanel_php_fpm [[check command:+][socket connect:N/A]]...clamd [[check command:+][socket connect:N/A]]...Done
[2016-03-21 19:47:31 +0100] OOM check ....Done
[2016-03-21 19:47:31 +0100] Disk check .... /tmp (/var/tmp) [8.51%] ... /dev/mapper/vg_cpanel1-lv_root (/) [30.72%] ... /usr/tmpDSK (/tmp) [8.51%] ... /dev/mapper/vg_cpanel1-lv_home (/home) [26.92%] ... /dev/sda1 (/boot) [15.14%] ... {status:eek:k} ... Done
Loading services .....clamd....cpanel_php_fpm....cpanellogd....cpsrvd....exim....ftpd....httpd....imap....mailman....mysql....named....nscd....pop....queueprocd....spamd....sshd..Done
Service Check Started
Service Check Finished

cpanel_tailwatchd_log_tail.txt:

Code:

[1978] [2016-03-21 20:09:53 +0100] [Cpanel::TailWatch::Eximstats] [SQLERR] Could not prepare query, logging SQL to /var/cpanel/sql
Cpanel::DBI::Mysql connect('','eximstats',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /usr/local/cpanel/Cpanel/DBI.pm line 89.
[1978] [2016-03-21 20:09:34 +0100] [Cpanel::TailWatch::Eximstats] [SQLERR] Could not prepare query, logging SQL to /var/cpanel/sql
Cpanel::DBI::Mysql connect('','eximstats',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /usr/local/cpanel/Cpanel/DBI.pm line 89.
[1978] [2016-03-21 20:08:33 +0100] [Cpanel::TailWatch::Eximstats] [SQLERR] Could not prepare query, logging SQL to /var/cpanel/sql
Cpanel::DBI::Mysql connect('','eximstats',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /usr/local/cpanel/Cpanel/DBI.pm line 89.
[1978] [2016-03-21 20:08:23 +0100] [Cpanel::TailWatch::Eximstats] [SQLERR] Could not prepare query, logging SQL to /var/cpanel/sql
Cpanel::DBI::Mysql connect('','eximstats',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /usr/local/cpanel/Cpanel/DBI.pm line 89.
[1978] [2016-03-21 20:08:21 +0100] [Cpanel::TailWatch::Eximstats] [SQLERR] Could not prepare query, logging SQL to /var/cpanel/sql
Cpanel::DBI::Mysql connect('','eximstats',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /usr/local/cpanel/Cpanel/DBI.pm line 89.

Can anybody help me?

Cheers,
Niklas