In our system there is a problem, I hope you can help us

Sometimes when replying to a ticket or create the page is blank or figure ... index.pl opening (like the attached image)
The log file does not indicate anything at that time, but other records. The path of the log /var/log/apache2# tail -f error.log
[Wed Mar 26 10:49:21 2014] -e: Use of uninitialized value $User{"UserAuthBackend"} in string eq at /opt/otrs//Kernel/System/User.pm line 1065.
[Wed Mar 26 10:51:55 2014] -e: Use of uninitialized value $User{"UserAuthBackend"} in string eq at /opt/otrs//Kernel/System/User.pm line 1065.
[Wed Mar 26 10:55:41 2014] [error] [client 10.169.69.211] File does not exist: /var/www/favicon.ico
[Wed Mar 26 10:57:09 2014] [error] [client 10.169.69.188] File does not exist: /var/www/favicon.ico
[Wed Mar 26 10:57:09 2014] [error] [client 10.169.69.188] File does not exist: /var/www/favicon.ico
[Wed Mar 26 10:57:09 2014] [error] :Apache2 IO flush: (103) Software caused connection abort at /opt/otrs//Kernel/Output/HTML/Layout.pm line 1715
:Apache2 IO flush: (103) Software caused connection abort at -e line 0[Wed Mar 26 10:57:31 2014] -e: Use of uninitialized value $GetParam{"ShownAttributes"} in join or string at /opt/otrs//Kernel/Modules/AgentTicketSearch.pm line 174.
[Wed Mar 26 10:58:09 2014] -e: Use of uninitialized value $GetParam{"ShownAttributes"} in join or string at /opt/otrs//Kernel/Modules/AgentTicketSearch.pm line 174.
[Wed Mar 26 10:58:47 2014] [error] :Apache2 IO flush: (103) Software caused connection abort at /opt/otrs//Kernel/Output/HTML/Layout.pm line 1715
:Apache2 IO flush: (103) Software caused connection abort at -e line 0[Wed Mar 26 10:58:48 2014] [notice] child pid 25639 exit signal Segmentation fault (11)
[Wed Mar 26 11:00:31 2014] -e: Use of uninitialized value $GetParam{"ShownAttributes"} in join or string at /opt/otrs//Kernel/Modules/AgentTicketSearch.pm line 174.
[Wed Mar 26 11:04:56 2014] -e: Use of uninitialized value $GetParam{"ShownAttributes"} in join or string at /opt/otrs//Kernel/Modules/AgentTicketSearch.pm line 174.
[Wed Mar 26 11:05:07 2014] [error] :Apache2 IO flush: (103) Software caused connection abort at /opt/otrs//Kernel/Output/HTML/Layout.pm line 1715
:Apache2 IO flush: (103) Software caused connection abort at -e line 0[Wed Mar 26 11:06:07 2014] [error] :Apache2 IO flush: (103) Software caused connection abort at /opt/otrs//Kernel/Output/HTML/Layout.pm line 1715
:Apache2 IO flush: (103) Software caused connection abort at -e line 0
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In the system log I found the only mistake is .. Wed Mar 26 11:14:29 2014 Error OTRS-CGI-10 Got no SessionID!
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The OTRS Version 3.3.5 - Linux version 2.6.32-5-amd64 (Debian 2.6.32-48squeeze4)
Oracle Database 11g
The base and OTRS are on different servers
Any idea?
regards