[Samba] Samba access unstable

Hi, all
I have tried to install samba(|3.0.28a|) in Ubuntu 8.04 in apt-get way.
When I used a Windows client to browse the share folder, I found
sometime it popups a note tell me this folder is not accessable,
sometime I can get in and modified the files.

Could someone help me check if the problem comes from my smb.conf?

Thank you very much.
BR,
Milo

Info of smb.conf :

> [global]
> server string = %h server (Samba, Ubuntu)
> map to guest = Bad User
> obey pam restrictions = Yes
> passdb backend = tdbsam
> pam password change = Yes
> passwd program = /usr/bin/passwd %u
> passwd chat = *Enter\snew\s*\spassword:* %n\n
> *Retype\snew\s*\spassword:* %n\n *password\s updated\ssuccessfully* .
> unix password sync = Yes
> syslog = 0
> log file = /var/log/samba/log.%m
> max log size = 1000
> dns proxy = No
> panic action = /usr/share/samba/panic-action %d
> invalid users = root
>
> [milo]
> path = /share
> valid users = milo
> read only = No
> guest ok = Yes
>
> [printers]
> comment = All Printers
> path = /var/spool/samba
> create mask = 0700
> printable = Yes
> browseable = No
>
> [print$]
> comment = Printer Drivers
> path = /var/lib/samba/printers







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