Stuck IP's on Apache

I just setup this module on my apache to avoid users from downloading multiple files at the same time from a given directory of my site.
Problem is, this module base on the apache proccess list, and sometimes, for some reason, the user IP gets stuck on that list for about 1 minute. For example, I start downloading a file, then stop, and apache still says it's sending that file to me.
So, when that happens, the user will be told he's downloading a file already, when he's actually not.

Why that happens? Is there a way to avoid this, maybe changing some config on apache?

Thanks in advance

 

 

 

 

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