lfd on server : Excessive resource usage: cpanel username (23862)

Hello,

Every time i am receiving message as

Time: Mon Oct 3 02:31:13 2011 +0530
Account: cpanel username
Resource: Process Time
Exceeded: 1809 > 1800 (seconds)
Executable: /usr/bin/php
Command Line: /usr/bin/php
PID: 23862
Killed: No


Server Modification:
FastCgi with nginx

If using Apache with suphp then no issue.

Waiting for solutions

Regards