samba - Jun 2006 - Samba requires Restart every 2-3 months

Hi All,
We have this issue where we are not able to login to Unix from windows.
 
Our system admins inform us that this is an issue with Samba and it requires our
unix box(Jepson) to be restarted.
 
We have very little information on Samba.  Any guidance on why it hangs every 
2-3 months would be great. 
Is there any way to get a fix/upgrade for this.
Thanks
Zakki