Sites stop working and needs "service httpd restart" occasionally

[kurozael]

Every day my sites stop working, and some functionality breaks such as submitting a ticket on WHMCS.

The same error in httpd logs occur even for a VPS where I'm only hosting 3 very simple basically HTML only sites.

Code:

[Fri Mar 25 14:20:01.452242 2016] [mpm_prefork:notice] [pid 30460] AH00171: Graceful restart requested, doing restart
[Fri Mar 25 14:20:01.585746 2016] [auth_digest:notice] [pid 30460] AH01757: generating secret for digest authentication ...
[Fri Mar 25 14:20:01.588132 2016] [lbmethod_heartbeat:notice] [pid 30460] AH02282: No slotmem from mod_heartmonitor
[Fri Mar 25 14:20:01.623856 2016] [mpm_prefork:notice] [pid 30460] AH00163: Apache/2.4.6 (CentOS) configured -- resuming normal operations
[Fri Mar 25 14:20:01.623883 2016] [core:notice] [pid 30460] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'

Followed by many of these:

Code:

[Fri Mar 25 14:20:02.639534 2016] [core:notice] [pid 30460] AH00052: child pid 25990 exit signal Segmentation fault (11)
[Fri Mar 25 14:20:11.657357 2016] [core:notice] [pid 30460] AH00052: child pid 26003 exit signal Segmentation fault (11)
[Fri Mar 25 14:20:12.660426 2016] [core:notice] [pid 30460] AH00052: child pid 26004 exit signal Segmentation fault (11)
[Fri Mar 25 14:20:55.681254 2016] [core:notice] [pid 30460] AH00052: child pid 25993 exit signal Segmentation fault (11)

I really need to fix this ASAP! Thanks