htaccess rule fails sometimes but not always - .htaccess

Question

i have the following rule to my htaccess
RewriteRule ^(el|en)/(.*).html/?$ article.php?lang=$1&url=$2 [L,NC,QSA]
When a user goes to
www.mydomain.com/en/this-is-an-article.html
the rule forward to article.php and show the page.
The problem is that sometimes the rules fails and instead of go to
www.mydomain.com/en/this-is-an-article.html
its go to
www.mydomain.com/article.php
and the page is not render because the passing parameters are not send and can not handle it
If you make another click to see the page the page render as expected.
Its the first time i see something like that.
full htaccess code
RewriteEngine on
Options -Indexes
AddDefaultCharset UTF-8
IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>
<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
# WEEK
<FilesMatch "\.(pdf|swf|js|css|jpg|png|gif|JPG)$">
Header set Cache-Control "max-age=604800"
</FilesMatch>
<ifModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file \.(html?|txt|css|js|php|pl|ttf|woff)$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</ifModule>
#fcp.php
RewriteRule ^(el|en)/fcp.php?$ fcp.php?lang=$1 [L,NC,QSA]
#tuner.php
RewriteRule ^(el|en)/index-b/(.*).html/?$ index-b.php?lang=$1&url=$2 [L,NC,QSA]
RewriteRule ^(el|en)/catalog-b/(.*).html/?$ catalog-b.php?lang=$1&url=$2 [L,NC,QSA]
#product.php
RewriteRule ^(el|en)/product/(.*).html/?$ product.php?lang=$1&url=$2 [L,NC,QSA]
#article.php
RewriteRule ^(el|en)/(.*).html/?$ article.php?lang=$1&url=$2 [L,NC,QSA]
#controller.php
RewriteRule ^(el|en)/(.*)/p/([^.]+)?$ controller.php?lang=$1&url=$2&p=$3 [L,NC,QSA]
RewriteRule ^(el|en)/(.*)/?$ controller.php?lang=$1&url=$2 [L,NC,QSA]
#index.php
RewriteRule ^(el|en)?$ index.php?lang=$1 [L,NC,QSA]
Can anyone help

Answer 1

Try placing this code at top of your .htaccess:
# disable MultiViews as it conflicts with mod_rewrite
Options +FollowSymLinks -MultiViews
RewriteEngine on
# skip further rewrites if rewrite has already happened OR else
# if request is for a valid file/directory
RewriteCond %{ENV:REDIRECT_STATUS} 200 [OR]
RewriteCond %{REQUEST_FILENAME} -d [OR]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -l
RewriteRule ^ - [L]