Just an update for all others that my be having this problem.
Resuni, thanks for all the help however that fix did not solve my problem.
It took a few weeks but what finally fixed it was changing the registry settings as per link below (both links below point to the same answer).
windows 7 stops sharing files
System error 64 - the specified network name is no longer available
Below solution is taken from Aaron's answer on the second link above: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\size
Your choices for this registry key are 1,2 and 3.
1 = Minimize Memory Used
2 = Balance
3 = Maximize Throughput for File Sharing and Maximize Throughput for Network Applications
Be sure to set this to (3). By default it is configured to 1.
I applied this change 1 week ago and have not had a problems since, prior to that it was happening several times a day.
Thanks for all the help.