Connection timed out error after End of file found

I am using Openfire 3.8.2 with Apache httpd 2.2.24.

The client connection are via JsJac with http-bind with JSJACHBC_MAX_WAIT=100 sec, with Timeout value in httpd is 240 sec

Everything works fine but sometimes the connection breaks with 503 error shown in httpd log.

This is always preceded by the following errors

[Wed Jun 26 09:48:13 2013] [error] (70014)End of file found: proxy: prefetch request body failed to :7070 () from ()

[Wed Jun 26 09:48:15 2013] [error] (70014)End of file found: proxy: prefetch request body failed to :7070 () from ()

[Wed Jun 26 09:48:19 2013] [error] (70014)End of file found: proxy: prefetch request body failed to :7070 () from ()

[Wed Jun 26 09:48:22 2013] [error] (110)Connection timed out: proxy: HTTP: attempt to connect to :7070 () failed

[Wed Jun 26 09:48:22 2013] [error] ap_proxy_connect_backend disabling worker for ()

[Wed Jun 26 09:48:23 2013] [error] proxy: HTTP: disabled connection for ()

Can anybody please suggest any solution