Several times in the past 4 days, one NIC I am using (of the two) on the Windows 2012 machine has just stopped working. The NIC indicator lights are off. I've tried unplugging/replugging the Cat-6 cable, different switches, etc, but it won't come alive without a reboot. Any suggestions? Nothing special going on the NIC. I've turned off the any of the "power saving" options, but it has all the factory set defaults otherwise. Server has been working fine for the prior 2 months otherwise.