php-WampApache间歇性假死

Windows下APACHE间歇性假死。
症状：两到三天会停一次，重启APACHE后又正常。
错误日志：
[Thu Nov 06 09:59:40 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Thu Nov 06 12:03:14 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Thu Nov 06 12:06:13 2014] [notice] Parent: Received shutdown signal -- Shutting down the server.
[Thu Nov 06 12:06:13 2014] [notice] Child 65812: Exit event signaled. Child process is ending.
[Thu Nov 06 12:06:14 2014] [notice] Child 65812: Released the start mutex
[Thu Nov 06 12:06:43 2014] [notice] Parent: Forcing termination of child process 2e8
[Thu Nov 06 12:06:43 2014] [notice] Apache/2.2.21 (Win32) PHP/5.3.10 configured -- resuming normal operations
[Thu Nov 06 12:06:43 2014] [notice] Server built: Sep 10 2011 11:34:11
[Thu Nov 06 12:06:43 2014] [notice] Parent: Created child process 80048
[Thu Nov 06 12:06:44 2014] [notice] Child 80048: Child process is running
[Thu Nov 06 12:06:44 2014] [notice] Child 80048: Acquired the start mutex.
[Thu Nov 06 12:06:44 2014] [notice] Child 80048: Starting 64 worker threads.
[Thu Nov 06 12:06:44 2014] [notice] Child 80048: Starting thread to listen on port 80.
[Thu Nov 06 12:14:30 2014] [warn] Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting
[Thu Nov 06 14:27:32 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Thu Nov 06 14:27:32 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.

.........

[Sun Nov 09 16:07:37 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Sun Nov 09 16:07:38 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Sun Nov 09 16:07:38 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Sun Nov 09 16:07:38 2014] warn指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Sun Nov 09 17:05:34 2014] [notice] Parent: Received shutdown signal -- Shutting down the server.
[Sun Nov 09 17:05:34 2014] [notice] Child 80048: Exit event signaled. Child process is ending.
[Sun Nov 09 17:05:35 2014] [notice] Child 80048: Released the start mutex