What error_log says ? It looks like httpd is crashing.
Maybe you are using some flv streaming mod which is not thread safe ?

2013/3/28 Esmq <e...@163.com>:
> hi, guys
>
>     i have come across a problem related to event mpm in apache(v2.4.3),
> that is
> connection may closed during transfer for some times. when i change to
> prefork mpm, everything goes well...
> i also try to set EnableSendfile & EnableMMAP to Off, but without work...
>
> following is the full Scenario of the problem..
>
> wget -O a.flv http://video.test.com/a.flv; md5sum a.flv
> --2013-03-27 18:15:51-- http://video.test.com/a.flv
> Resolving video.test.com... 192.168.1.100
> Connecting to video.test.com|192.168.1.100|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 290899940 (277M) [video/x-flv]
> Saving to: “a.flv”
>
> 19% [=======================> ] 56,424,265  2.50M/s   in 16s
>
> 2013-03-27 18:16:07 (3.30 MB/s) - Connection closed at byte 56424265.
> Retrying.
>
> --2013-03-27 18:16:08--  (try: 2) http://video.test.com/a.flv
> Connecting to video.test.com|192.168.1.100|:80... connected.
> HTTP request sent, awaiting response... 206 Partial Content
> Length: 290899940 (277M), 234475675 (224M) remaining [video/x-flv]
> Saving to: “a.flv”
>
> 19% [++++++++++++++++++++++++ ] 56,424,265  --.-K/s   in 11s
>
> 2013-03-27 18:16:20 (0.00 B/s) - Connection closed at byte 56424265.
> Retrying.
>
> --2013-03-27 18:16:22--  (try: 3) http://video.test.com/a.flv
> Connecting to video.test.com|192.168.1.100|:80... connected.
> HTTP request sent, awaiting response... 206 Partial Content
> Length: 290899940 (277M), 234475675 (224M) remaining [video/x-flv]
> Saving to: “a.flv”
>
> 100%[++++++++++++++++++++++++====================================================================================================>]
> 290,899,940 3.37M/s   in 58s
>
> 2013-03-27 18:17:20 (3.86 MB/s) - “a.flv” saved [290899940/290899940]
>
> 671034be784ce6eb7bc9366572f5441f  a.flv
>
>

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