samba - Jun 2009 - Problems with "samba share" after return from standby/sleep with Ubuntu 8.10

I have a D-Link DNS-323 NAS Drive which I'm accessing from a desktop PC
running Ubuntu 8.10. When I first mount the DNS-323 share, everything is
hunky-dory. I can access folders and files and save them. However, when my
desktop PC has returned from standby I have problems saving files, which
manifests itself in a number of ways:

(1) If I "drag and drop" copy a file from another location (ie: my
desktop),
the original file modification date is not preserved, ie; it becomes the
date and time I carried out the the file copy.
(2) If I open, edit and try to re-save an OpenOffice file, I get a
"permissions" error.
(3) If I open, edit and re-save a text file, I get a "not a directory
error"
(4) rsync gives error messages like: failed to set times on
"dir_name"; not
a directory (20)
(5) If my Thunderbird mailboxes are located on the DNS-323, TB keeps
downloading the same email from the POP server over and over.

The permissions for the folders on the DNS-323 share all seem to be ok.  I
believe the DNS-323 is running Samba 3.0.24

I think this started happening when I "upgraded" from Ubuntu 7:10 to
8:10
but I'm not sure because that upgrade also caused a load of other problems
with samba shares, which have taken months to sort out. This seems to be
last remaining problem before I can get back to where I was with Ubuntu
7.10. (Note, the "upgrade" from 7.10 to 8.10 was a clean install).

I've tried posting on Ubuntu and D-Link forums but still haven't got
this
resolved.  Please note I am a humble user and certainly not any kind of
technical expert on Samba or Linux.  Any help would be much appreciated.
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