Radius freeze

[Tokie]

Hi everyone,
I'm using FreeRADIUS Version 1.1.7 with Mysql.
I use for Hotspot system.

All works fine, but after around one day without activity, the radius
server don't answer.
Therefore, if I restart (/etc/init.d/freeradius restart), all works ok!!

I monitor with the command "ps" and just restart result:
# ps ax | grep freeradius
26118 ?        Ssl    0:00 /usr/sbin/freeradius

Immediately after the connection of a hotspot's user:
# ps ax | grep freeradius
26118 ?        Ssl    0:00 /usr/sbin/freeradius
26158 ?        Z      0:00 [freeradius] <defunct>

What does this mean  *_/[freeradius] <defunct>/_*?

If hotspot's user disconnect, nothing changes!!

Could you help me??
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