OSX disconnected from windows 7 smb share

Hi,

I have a windows 7 running as a data server.

And often all the OSX computers will stop access the windows smb share drives for no reason.

The interesting bit is that the windows 7 running on virtualbox on top of the OSX can still connect to the share drives.

I have tried reboot the OSX but they still wont reconnect.

The only way to fix it either reboot the windows 7 or restart the "server" service in windows.

It feels like somehow the OSX trigger an error and kill the windows server since it usually happened when streaming video from windows to mac via VLC.

Anyone has similar problem or a solution to this problem?