It seems that the reason you are getting banned is because the Mod_Security thinks that you are trying to use an exploit against your own site.
This is because of the URLs that your website uses, such as: http://www.all-w.org/showthread.php?47435-Black-Swan-(2010)
Not only is that URL not SEO friendly, but also seems to be causing you to trigger the mod_security rules.
f you change the way your website outputs URLS, you may be able to solve this problem.
#
# If mod_security is enabled, attempt to disable it.
# - Note, this will work on the majority of hosts but on
# MediaTemple, it is known to cause random Internal Server
# errors. For MediaTemple, please remove the block below
#
<IfModule mod_security.c>
# Turn off mod_security filtering.
SecFilterEngine Off
# The below probably isn't needed, but better safe than sorry.
SecFilterScanPOST Off
</IfModule>