Ok-- This has been a recurring issue for us that continues to cause frustration:
We have a PC that keeps either going offline or saying Network cable unplugged. It will do this off and on every 10-15 minutes or so until we run a system file checker. This is sometimes followed up with a netsh winsock reset catalog. It tends to only occur when we reboot our exchange server. It is only this user and only on this PC/location.
Things already tried:
troubleshooting data drop (even had it replaced)
replacing all cables
replacing network switch
replacing NIC drivers