2.0.7 drives disconnecting

[Jayanti Bodhania]

I am running Samba 2.0.7 under Solaris 2.5.1 (x86 and sun4).
Various shares are setup, which get connected when users log
on from their NT4 PC's.  No problems as far as this group of
users are concerned.

We also have lots of users using Network Computers (NC's)
who log onto TSE/MetaFrame servers.  Unfrtunately, these
bunch of users are encountering problems whereby some of
their drives randomly get disconnected.  This is causing
a lot of grief.  Has anyone else encountered such problems?
If so, is there a cure?

My smb.conf is included below.  Can anyone see anything in
there likely to cause the problems we are encountering?

TIA

Regards
Jayanti Bodhania

========
smb.conf
========

[global]
	load printers = yes
	log file = /var/log/samba/%m.log

	workgroup = maunsell-uk
	server string = Samba Server on %h (%v)
	encrypt passwords = Yes
	hosts allow = 193.116.32. 193.116.33. 193.116.34. 193.116.35. 193.116.36. 193.116.38. 193.116.39. 193.116.40. 193.116.41. 193.116.42. 193.116.43. 127. 10.86.176. 10.86.177. 10.86.178. 10.86.179. 10.86.180. 10.86.181. 10.86.182. 10.86.183. 10.86.184. 10.86.185. 10.86.186. 10.34.80.
	socket options = TCP_NODELAY
	deadtime = 0 
	keepalive = 0
	create mask = 0664
	directory mask = 0775
	preserve case = Yes
	short preserve case = No
	hide dot files = No
	mangled names = Yes
	mangle case = yes
	max log size = 50
	os level = 34
	print command = lp -c -oraw -d%p %s; rm %s
	security = domain
	domain logons = No
	domain master = No
	preferred master = No
	wins support = No
	time server = No
	dns proxy = No
	local master = Yes
	wins server = 193.116.32.5
	password server = lonq
	logon script = SMBlogon.bat
	logon drive = h:
	unix realname = Yes
	NIS homedir = Yes
	homedir map = wcp.home
	locking = no
	include = /usr/local/etc/printers.conf

[netlogon]
	comment = Witham Network Logon Service
	path = /opt/MSPolicy
	locking = No

[mspolicy]
	comment = Witham Solstice Network Logon Service
	copy = netlogon

[homes]
	comment = Witham Home Directories
	root preexec = /usr/appmap/wrappers/snprof2bat %L %u %m
	root postexec = rm -f /opt/MSPolicy/tmp/%m-%u.bat
	read only = No
	browseable = No

[tmp]
	comment = Witham Scratch Area
	path = /export/tmp
	read only = No

[opt]
	comment = Witham Office Enterprise Applications
	path = /opt
	read only = No

[gmp]
	comment = Witham Global Templates
	path = /opt/gmp
	read only = No

[localopt]
    comment = Witham Local Specific Applications
    path = /local/opt
    read only = No

[proj2]
	comment = Witham Project Area 2
	path = /export/project2
	read only = No

[proj3]
	comment = Witham Project Area 3
	path = /export/project3
	read only = No

[proj4]
	comment = Witham Project Area 4
	path = /export/project4
	read only = No

[proj5]
	comment = Witham Project Area 5
	path = /export/project5
	read only = No

[pwise]
    comment = ProjectWise Data
    path = /export/pwise
    read only = No
    browseable = No

[indexes]
	comment = Technical Indexes Virtual CD
	path = /opt/isv/win/indexes
	locking = No
	read only = Yes

[autocad]
	comment = Witham Autocad Templates
	path = /opt/gmp/etc/autocad
	locking = No
	read only = No

[acadlddt]
	comment = Witham AutoCAD LDDT Templates
	path = /opt/gmp/etc/acadlddt
	read only = No

[acadciv]
        comment = Maunsell House AutoCAD LDDT Templates
        path = /opt/gmp/etc/acadciv
        read only = No