nmbd daemon dies

[Per-Erik Persson]

I'm runnig Samba version 1.9.18p10 on a Redhat 5.1 Intel platform with 256
Mb ram and 45 Gb disk.
It serves about 50 clients running win95 with the Samba server as the WINS
server
The system has worked fine for several months since installation with no
reboots.
But recently the nmbd deamon quit working, sometimes there are two daemons
running.
It has to be killed and then started again or i have to send it a SIGHUP.
The log.nmbd does look normal, no strange things there.

What should i look for to find the problem or is this something wich can be
solved with an upgrade.
When i read the mailinglist i get pretty frightend with all the 2.* problems
i see.