A few days ago did update on php54 to 5.4.42 and now I have a strange problem with Apache (2.2) and PHP-FPM.
The server works well, but after a few hours (1-2-3 or even more, each time is different) the web sites on my vps just stops working. Why? I have no idea. When I check running processes everything is fine, httpd is running, php-fpm is running but the web sites not works and only loading and loading with blank page or error 500 or 503 or 520 or 521 or 522 or 523, each time is different

The only solution is to run "sh /script/restart-all" to restart all processes or "service httpd restart" for apache but after a few hours I got this problem again. I tried "sh /script/cleanup" to fix all services but without result because after a few hours my vps again got this problem.
In fact KloxoMR works fast, the VPS is not overloaded, all processes works, but the websites don't work

I think it's a bug in httpd or fpm.
How to fix this?
sh /script/sysinfo:
A. Kloxo-MR: 7.0.0.b-2015070802
- Web:
- PHP: php54s-5.4.42-1.ius.el6 (cgi mode)
B. Plateform:
- OS: CentOS release 6.6 (Final) x86_64
- Hostname: vps.zaknigi.com
C. Services:
1. MySQL: MariaDB-server-10.0.20-1.el6.x86_64
2. PHP:
- Branch: php54-cli-5.4.42-1.ius.el6.x86_64
- Multiple:
* php53m-5.3.29-1.ius.el6
* php54m-5.4.42-1.ius.el6
* php55m-5.5.26-1.ius.el6
- Used: php54m
3. Httpd: httpd-2.2.29-2.mr.el6.x86_64
- PHP Type: php-fpm_event
4. Lighttpd: --uninstalled--
5. Hiawatha: --uninstalled--
6. Nginx: --uninstalled--
7. Cache: --uninstalled--
8. Dns: bind-9.9.7-1.mr.el6.x86_64
9. Qmail: qmail-toaster-1.03-1.3.55.mr.el6.x86_64
- with: courier-imap-toaster-4.1.2-1.3.18.mr.el6.x86_64
D. Memory:
total used free shared buffers cached
Mem: 2048 418 1629 67 0 234
-/+ buffers/cache: 183 1864
Swap: 0 0 0
E. Disk Space:
Filesystem Size Used Avail Use% Mounted on
/dev/simfs 80G 3.5G 77G 5% /