Сервер последние 3 дня стал падать, отдавая 502 ошибку спустя 2-3 часа. В логах httpd:
[Mon Jul 31 11:56:24 2017] [notice] Apache/2.2.15 (Unix) mod_fastcgi/2.4.6 mod_rpaf/0.6 PHP/5.3.29 configured — resuming normal operations [Mon Jul 31 11:56:25 2017] [error] server reached MaxClients setting, consider raising the MaxClients setting [Mon Jul 31 11:56:35 2017] [notice] caught SIGTERM, shutting down [Mon Jul 31 11:56:36 2017] [notice] Apache/2.2.15 (Unix) mod_fastcgi/2.4.6 mod_rpaf/0.6 PHP/5.3.29 configured — resuming normal operations zend_mm_heap corrupted [Mon Jul 31 12:31:19 2017] [notice] child pid 27463 exit signal Segmentation fault (11) zend_mm_heap corrupted zend_mm_heap corrupted [Mon Jul 31 12:45:07 2017] [error] server reached MaxClients setting, consider raising the MaxClients setting [Mon Jul 31 13:18:16 2017] [notice] child pid 4921 exit signal Segmentation fault (11) [Mon Jul 31 13:56:15 2017] [notice] child pid 32413 exit signal Segmentation fault (11) zend_mm_heap corrupted [Mon Jul 31 15:01:39 2017] [notice] caught SIGTERM, shutting down [Mon Jul 31 15:01:40 2017] [notice] Apache/2.2.15 (Unix) mod_fastcgi/2.4.6 mod_rpaf/0.6 PHP/5.3.29 configured — resuming normal operations zend_mm_heap corrupted zend_mm_heap corrupted [Mon Jul 31 15:29:05 2017] [error] server reached MaxClients setting, consider raising the MaxClients setting zend_mm_heap corrupted [Mon Jul 31 16:00:09 2017] [notice] child pid 18382 exit signal Segmentation fault (11) [Mon Jul 31 16:02:02 2017] [notice] child pid 17800 exit signal Segmentation fault (11) [Mon Jul 31 16:19:12 2017] [notice] child pid 15365 exit signal Segmentation fault (11) zend_mm_heap corrupted [Mon Jul 31 16:33:11 2017] [notice] child pid 15653 exit signal Segmentation fault (11)

оперативки 64Гб на сервере, 30гб под mysql отдано.
Апач настроен так:
StartServers 2 MinSpareServers 2 MaxSpareServers 20 ServerLimit 32 MaxClients 32 MaxRequestsPerChild 1000

Перезапускаешь httpd и все работает. Куда копать? Спасибо заранее