Losing Windows 7 Shares, and my hair.

I have been through this countless times. I have Snow Leopard 10.6.6 on a MBP and windows 7 on a desktop. I have multiple shares on the windows machine that I access from my mac. All of a sudden, when transferring a file over smb, the transfer quits because the data "cannot be read or written" and I am unable to access the shares. When I try to reconnect to the shares I get an error saying

"Connection Failed. There was an error connecting to the server "10.0.10.5". Check the server name or IP address, and then try again. If you are unable to resolve the problem contact your system administrator (Thats Me)."

This problem persists until I restart both the mac and the pc. I use account protected sharing, not guest sharing on the pc but I have tried both with the same result. I have adjusted the 'Network Security: LAN Manager Authentication Level' in windows.

Every 12 months or so I do a clean install on my systems and the problem dissappears. After a period of time that could be 1 day or 10 months the problem returns. I have seen this issue since 10.5 and Vista and it keeps crawling back. Any feedback would be great, but I have probably already tried it.