Rails server goes down frequently in production mode

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Apache

Rails

I am using Rails 3.0.5 version and Ruby 1.9.2 in my application.

Its working fine in development mode but in production mode server goes down after every 3-4 days.

It gives below error in /var/log/https/error.log file.

[Sun Oct 21 09:39:03 2012] [error] [IP_ADDRESS] Premature end of script headers: [ pid=24971 thr=1 file=ext/apache2/Hooks.cpp:817 time=2012-10-21 09:39:03.371 ]: The backend application (process 29805) did not send a valid HTTP response; instead, it sent nothing at all. It is possible that it has crashed; please check whether there are crashing bugs in this application.

I am not getting what's the reason for server down.