Vm-pop3d Presistent Connection

Hello, I have a problem with the vm-pop3d service I have set the option (--daemon=30) to 30 and the time out to 900 in /etc/init.d/vm-pop3d but still is not enough, many connections to the pop3 server are dropped is like the connections remains active (persistent) because when I try to restart the server I get a failed error on shutting down and still get the timeout error with outlook, I need to kill all the vm-pop3d process a then restart it in order to work but 10 or 15 minutes later I get the timeout error again, so I don't know why is failing continuously and why don't shutdown properly when restarting the service.

[root@server ~]# service vm-pop3d restart
Shutting down vm-pop3d: [FAILED]
Starting vm-pop3d: [ OK ]

[root@server ~]# ps -fea | grep vm-pop3d
root 25297 1 0 16:14 ? 00:00:00 vm-pop3d --daemon=30 -t 900
root 25317 25297 0 16:14 ? 00:00:00 vm-pop3d --daemon=30 -t 900
root 25434 25297 0 16:14 ? 00:00:00 vm-pop3d --daemon=30 -t 900 ....