apache还在运行，但是网页打不开 求高手帮忙解决方案

apache还在运行，但是网页打不开 求高手帮忙
这几天我在服务器里面 装了个php环境 是散装的 服务器系统是server2003 然后 网站有时候会突然打不开 但是apache还在运行 只能重启apache服务了 请各位高手帮忙看下是什么啥问题 apache错误代码贴出 

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<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Starting the Apache2.2 serviceThe Apache2.2 service is running.rmine the server's fully qualified domain name, using 192.168.1.182 for ServerName[Sun Nov 20 02:56:33 2011] [notice] Apache/2.2.9 (Win32) configured -- resuming normal operations[Sun Nov 20 02:56:33 2011] [notice] Server built: Jun 13 2008 04:04:59[Sun Nov 20 02:56:33 2011] [notice] Parent: Created child process 2236httpd.exe: Could not reliably determine the server's fully qualified domain name, using 192.168.1.182 for ServerNamehttpd.exe: Could not reliably determine the server's fully qualified domain name, using 192.168.1.182 for ServerName[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Child process is running[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Acquired the start mutex.[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Starting 64 worker threads.[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Starting thread to listen on port 80.[Sun Nov 20 02:56:58 2011] [notice] Parent: Received shutdown signal -- Shutting down the server.[Sun Nov 20 02:56:58 2011] [notice] Child 2236: Exit event signaled. Child process is ending.[Sun Nov 20 02:56:59 2011] [notice] Child 2236: Released the start mutex[Sun Nov 20 02:57:00 2011] [notice] Child 2236: All worker threads have exited.[Sun Nov 20 02:57:00 2011] [notice] Child 2236: Child process is exiting[Sun Nov 20 02:57:00 2011] [notice] Parent: Child process exited successfully.

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贴出error.log的日志内容 另外打不开的时候查看系统进程apache 是不是吃掉了大量的内存