Zabbix_server 1.6.5 crash

[lentyai]

I've got 1.6.4 server as Master node and 1.6.5 version as child node.
Sometimes child node is crashed.

11328:20090625:080758 One child process died. Exiting ...
11328:20090625:080800 ZABBIX Server stopped. ZABBIX 1.6.5 (revision 7442).

If I turn debuglevel=4, server work more capacity. But I don't need debug level 4. All servers work with debug level 3.

Now I downgrade server to 1.6.4 version. It more stability.

Any ideas?