Two solutions to keep mapped drives connected (live)
1. Change the setting on the NIC
A. Right click NIC and select Properties
B. On the Power Management tab uncheck “Allow the computer to turn off this device to save power.”
2. Registry hack
a. Create new REG_DWORD KeepAliveTime and set it to 00300000
b. Create new REG_DWORD KeepAliveInterval and set it to 00001000
What this does is that it sends keep alive packets every 5 minutes to the server you are mapped to making the connection live and not idle.