[Samba] samba performance degrade

[vishesh]

dear all
  I am using samba 3.0.28 on RHEl 5.2. I am using samba with winbind 
that authenticate window 2003 domain. From last few months samba was 
running properly. But today samba server performance badly, even 
sometime mapped drive on xp disappear. When i tried to connect samba 
shares, error appear server not available. Anyone suggest me what may be 
the problem. Why samba performance degrade after running around a month.

my configuration is as follows

#======================= Global Settings 
=====================================

[global]
#--authconfig--start-line--

# Generated by authconfig on 2008/09/04 22:25:21
# DO NOT EDIT THIS SECTION (delimited by --start-line--/--end-line--)
# Any modification may be deleted or altered by authconfig in future

   workgroup = abp
   password server = s2.abp.del
   realm = ABP.DEL
   security = ads
   idmap uid = 16777216-33554431
   idmap gid = 16777216-33554431
   template shell = /bin/bash
   winbind use default domain = true
   winbind offline logon = false
   winbind enum users = yes
   winbind enum groups = yes

#--authconfig--end-line--
server string =
netbios name = abpdel2
admin users = @"abp\domain admins"
# ----------------------- Network Related Options -------------------------
#


    passdb backend = tdbsam



 map read only = no
;    map system = no
;    store dos attributes = yes
hide dot files = yes
veto files=/lost+found/Trash/Recycler
#============================ Share Definitions 
==============================

;[homes]
;    comment = Home Directories
;    browseable = no
;    writeable = yes
;    valid users = %S
;    valid users = MYDOMAIN\%S

;[printers]
;    comment = All Printers
;    path = /var/spool/samba
;    browseable = no
;    guest ok = no
;    writeable = no
;    printable = yes

# Un-comment the following and create the netlogon directory for Domain 
Logons
;    [netlogon]
;    comment = Network Logon Service
;    path = /var/lib/samba/netlogon
;    guest ok = yes
;    writable = no
;    share modes = no


# Un-comment the following to provide a specific roving profile share
# the default is to use the user's home directory
;    [Profiles]
;    path = /var/lib/samba/profiles
;    browseable = no
;    guest ok = yes


# A publicly accessible directory, but read only, except for people in
# the "staff" group
;    [public]
;    comment = Public Stuff
;    path = /home/samba
;    public = yes
;    writable = yes
;    printable = no
;    write list = +staff

[design]
    comment = "home folder for design department"
    path = /data/design
    vfs object = recycle
    recycle:repository = /data/design/Trash
    recycle:keeptrace = Yes
    writeable = yes
    create mask = 644
    directory mask = 2755
[home]
    comment = "home folder for bwedit"
    path = /data/edit/home
    vfs object = recycle
    recycle:repository = /data/edit/home/Trash
    recycle:keeptrace = Yes
    writeable = yes
    create mask = 644
    directory mask = 2755

[user]
    comment = " home directory to tt feature and ab edit users"
    path = /data/edit/user
    vfs object = recycle
    recycle:repository = /data/edit/user/Trash
    recycle:keeptrace = Yes
    writeable = yes
    create mask = 644
    directory mask = 2755
[mark]
    comment = "marketting users"
    path = /data/marketting
    vfs object = recycle
    vfs:repository = /data/marketting/Trash
    vfs:keeptrace = Yes
    writeable = yes
    create mask = 644
    directory mask = 2755

[system]
    comment = "home folder for it"
    path = /data/system
    vfs object = recycle
    recycle:repository = /data/system/Trash
    recycle:keeptrace = Yes
    writeable = yes

[com]
    path=/data/marketting/com
    vfs object = recycle
    recycle:repository = /data/marketting/Trash
    recycle:keeptrace = Yes
    writeable=yes