Upload problems from some of my users

[omexlu1]

Hello,

I have the problem that some of my user with 64k connection can't upload anything using php in my community.

Error in Logs:

[Thu May 28 19:13:47 2015] [warn] [client XXXXXXXXXX] (70014)End of file found: mod_fcgid: can't get data from http client, referer: https://domain.tld/thread/5606-test/?postID=110859

my fcgid.conf

<IfModule mod_fcgid.c>

<IfModule !mod_fastcgi.c>
    AddHandler fcgid-script fcg fcgi fpl
</IfModule>

  FcgidIPCDir /var/lib/apache2/fcgid/sock
  FcgidProcessTableFile /var/lib/apache2/fcgid/shm

  FcgidIdleTimeout 40
  FcgidProcessLifeTime 30
  FcgidMaxProcesses 20
  FcgidMaxProcessesPerClass 8
  FcgidMinProcessesPerClass 0
  FcgidConnectTimeout 30
  #FcgidIOTimeout 45
  FcgidIOTimeout 100
  FcgidInitialEnv RAILS_ENV production
  FcgidIdleScanInterval 10

</IfModule>

With a lot of users it works less problems, what can i do ?