My website has been slowed down a little last couple of days. I\'ve looked into my error log and found lots of these:
[Mon Sep 30 00:09:53 2013] [error] [c
The last block:
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
Is most likely re-injecting a changed request URI over and over again which could cause such an internal redirect error. Check the error log with debugging level enabled to trace each redirect step, it makes things much more visible and will tell you exactly which redirect rules are triggering it.
For a detailed description and how to prevent the re-injection, please see:
The solution outlined there actually should do it in your case as well. It's pretty much the same, even the file-names are identical.