The Strange Case of the Missing Shared Devices...

Dear Forum,
I am currently having intermittent trouble with the connection of shared devices.
The network consists of a MBP, Qnap TS109 and a Canon printer hooked up via LAN to a WAG200G. The Qnap serves music to a PS3 (WLAN) and the Mac and also serves as a TimeMachine back up device.
The problem is that every so often I lose my Shared Devices in the Finder side-bar. They just disappear.
I have managed to reconnect by playing with the Network connections preferences, but as I suspected (due to exhausting the permutations), this solution has come to an end and now I cannot urge them to reappear (unless I restart (which is a solution, but not an entirely satisfactory one)…
All devices have been set to use static IP address (none conflict).
The Mac’s settings are as follows:
TCP/IP-
Configure IPv4 Manually: then my IP address.
Subnet and router are both correct as I can connect to the Qnap & WAG admin pages and internet (I’m not sure if that is a correct test of these settings, but the numbers are correct).
Configure IPv6: Off.
Under DNS : I have entered both DNS servers as per the instructions of the ISP (I have been with them for years and these are correct).
WINS- (I don’t know what this is but…)
NETBIOS Name: the name of my Mac (All uppercase (don’t know why, but looks definitely windows (ish))
Workgroup: (blank)
WINS Servers (blank),
802.1X & Proxies: everything is per the default setting as I have never touched anything in these options.
Ethernet-
ID: My Mac MAC
Configure: Auto
Speed, Duplex and MTU have never been touched, but I am assuming that Auto covers these.
Under Network (System Preferences), then Location: Auto, then next to Status: Connected (currently active and correct IP)
The WAG is the only thing on this mini network that sets DHCP, I could change this to disable as everything has it’s own Static IP, but is there any need?
(I hope I am getting the terminology correct and not inadvertently creating confusion.)
The PS3 sees the Twonky server in the Qnap, so I am not sure if that is an issue, it doesn’t appear to be.
So why the missing devices?
None of this would actually be a problem if it was not for the fact that once the Qnap disappears from the Finder side-bar, TimeMachine does not back up (yet I can connect via a browser to the Qnap, even if it is not present in the side-bar).
The problem is I feel as though my thinking is a bit blinkered as I am only concentrating on the Network connection aspect, yet I am afraid I am not entirely sure what else I should be considering. That is to say what is causing the Mac hooked up to a perfectly adequate connection/ functioning network to suddenly cause it to drop the devices, yet retain connection by other means?
Unfortunately a forum member had exactly the same problem but sadly removed the query from open questions.
It goes without saying (but there is no harm in me saying it anyway), but any help would be appreciated.

Bump
This recently happened to me as well, actually it's happened for awhile, and only recently have begun to try to find the answers. Did you ever find out what happened?
Also seems like this post: http://discussions.apple.com/message.jspa?messageID=11367180
But that has no answers posted either. Perhaps a reformat and stick with 10.6.2, which is what I think the last version the "Shared Devices" automatically showed without deliberately mounting a network drive.
My situation is pretty much the same, "Shared Devices" do not automatically show up on the left sidebar. If I know the IP address or netbios name, I can mount network hard drives: Command + K and smb://ipaddress
My Computers, I have an iBook G4, which used to automatically pop up; a Windows7 computer that used to automatically show; and an Ubuntu 10.04 computer that would show up as well for screen sharing and smb.
Possible culprits include: netbios/smb problems, mDNSresponder/Bonjour problems, other networking config. No settings permutations have fixed the problem.

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Bump
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