jwchat goes dead by itself after working for some times

Hi,
I got ejabberd and jwchat and Apache 2 worked at https://breakevilaxis.org. I works after I set it up. But after a couple of days it will die by itself. Then I apachectl restart. It will be working. The Apache is working. When I try to login, it says the service is unavailable. I do not know it is ejabberd's problem or JWchat's problem or Apache's problem.
Thanks!