Take a look at this reg key if your computer is falling off the network during idle time.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\
Key: The_Device_Number (will be something like 001, 002, 003, etc.)
Type: DWORD
Value: PnPCapabilities
Data: 24
Notes
Disable sleep for everything
powercfg /x -hibernate-timeout-ac 0
powercfg /x -hibernate-timeout-dc 0
powercfg /x -disk-timeout-ac 0
powercfg /x -disk-timeout-dc 0
powercfg /x -monitor-timeout-ac 0
powercfg /x -monitor-timeout-dc 0
Powercfg /x -standby-timeout-ac 0
powercfg /x -standby-timeout-dc 0
tags: MrNetTek