Upon checking on the Apache logs, I've found messages like below.
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[Fri Aug 16 10:21:00 2012] [apc-warning] Unable to allocate memory for pool. in /var/www/vhosts/DOMAIN.com/httpdocs/modules/mod_roknavmenu/helper.php on line 25.
[Fri Aug 16 10:21:00 2012] [apc-warning] Unable to allocate memory for pool. in /var/www/vhosts/DOMAIN.com/httpdocs/modules/mod_roknavmenu/helper.php on line 41.
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It was because of memory limitation in APC extension of PHP.
To fix it, you need to increase the memory limit of APC. Edit the file - /etc/php.d/apc.ini
Look for apc.shm_size and increase its size.
