Windows 7 Pro - Network Identifying but has access to network folders and Internet.

All computers run a program off a network drive but ar random, all computers on the network randomly drops their network drive. None of the computers lose internet access. The server and all computers are Windows 7 Professional.

The last time this happened, I went into network and sharing center to see the attached image yet the computer had access to both the network drives and internet access. My remote access to the computer, and the server was never disconnected.

Computer ----- Yellow Exclamation ! ----- Identifying (Grayed out)----- Red X -----  Internet (Grayed out)

Most recently when they're experiencing problems, they would simply move the mouse on the server. They say the server's monitor would be black and would turn back on.

Steps Already Taken:
The server never sleeps.
The server does not have a screen saver.
The server cannot turn off the network card to save power.
The server is set to never turn off the hard drive.
QOS and IPV6 disabled, IPV4 enabled on all computers. (QOS needs to be disabled for a program to run properly).
Disabled Windows Update Service.
Tested RAM on Server.
Network Cable from server to switch replaced.
Switch replaced.
Drivers and Windows Updated.
Replaced one of the hard drives in the servers raid.
Replaced Secondary Power Supply for Server.


If anyone has any suggestions, that'd be great!