Customer has a 100 R2 2.75 and everytime you want to connect to Lan for programming you have to reset the system first, the Ip address pings the Network card shows up on a network scan just wont connect until a reboot, any Ideas?

Firewall might be shutting down the ports due to inactivity? When it is down use a port checker tool to see if the correct ports are open.

Are there any external port forwards to the system? It may be getting spam requests and that will cause the lan to lockup

Wonder if there is a ip conflict and someone else is using your ip addy ...same as system or you have a bad network card