Loss of network share from Mac to PC

I have a lot of music / videos / pictures stored on a PC with RAID'd discs which are exposed as shares.
I mount these from my iMac and access them.
Periodically, (I think after the iMac has gone to sleep and been revived) these shares stop being accessible. The finder window opens, but there's no directories or files in them. I can't reconnect to recover the connection, but if I restart the iMac they come back.
Anyone know why, and how I can stop the connection going south for the winter when the iMac sleeps?
Ta
Alex

Microsoft changed how SMB works for sharing with Win7, and Apple hasn't changed their sharing in response. There are some problems because of this. Usually, though, it's the WIndows box that goes to sleep and causes the connection to drop.
It's know to be a Win 7 problem as there are similar problems when Linux users try to connect, and also there were no problems with Vista or WinXP, on the same hardware. This thread <http://www.tomshardware.com/forum/75-63-windows-samba-issue> offers some solutions which might help you.

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