SMB sharing drops connection in Windows 7/Vista/XP

So interesting tidbit here. Apple Enterprise still hasn't gotten back to me with an answer on this one.
I have file sharing set up, a couple of different folders with some simple permissions. Nothing fancy. All shares work perfect under AFP and SMB on any Mac in the office. However, I have found on both Windows XP/Vista/7, large file transfers seem to drop the connection saying that either the file has changed or it was renamed or something along those lines, basically, it errors out and I can either skip the file or cancel the transfer. I've tested it on multiple machines with all same results. Here's a kicker, I even clean installed Windows 7 on two machines (so I know there are no software/hardware issues or malware) and it will exhibits the same behavior.
Any thoughts? I've done the exact same transfer either via Gigabit Ethernet and WiFi on the Mac using both protocols with no issues. I have a simple network:
Cisco Gb Ethernet Router
Cisco Gb Ethernet Switch (all traffic, including the server and all clients go through this switch, it is an unmanaged switch)
Linksys A/B/G/N WAP
Mac mini running 10.8.2 and 2.2.1 server (has all correct DNS and certificate settings)
The only thing I can think of is perhaps an issue with the PCs (which are 10/100) and the Gb Ethernet? Everything for the server appears to be functioning just fine?

Hi Bryan -
First, thank you for taking the time to respond. The answer to your 2 questions is yes and no, respectively. I've already been on the phone with enterprise support with Apple several times and there is definitely a "known issue" regarding the transfer of large files, and large numbers of files over SMB with mountain lion. The SessTimeout tip definitely helped with the file copy issue, but didn't fix the issue I had of keeping large numbers of files open over the network. With my Windows Home Server, I can open a project with thousands of files in my DAW (digital audio workstation) over the network. But with the files residing on the OS X server, they open but then after several minutes, they literally go offline and "disappear". It's very frustrating. I should state that I did buy and install Dave 10 and that fixed the problem, so the problem is definitely on the Apple OS side, I was just hoping that this workaround with the SessTimeout would allow me to go back to Apple's SMB implementation. It just "feels" better to use the Server's implementation rather than a 3rd party app on top of it. Plus, it should just work. Maybe Mavericks will fix it. Maybe.
Just thought you might have another clever workaround that might make this work. At least with this workaround I can save Word and Excel files to the network without it taking 60 seconds.
any thoughts are greatly appreciated.
Charles.

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Options
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