i cannot believe that this issue has not been resolved since 2011, i started to get this issue 2-3 days ago, sometimes the NIC works and most of times i have to uninstall then scan hardware in device manager, it slows down windows startup.
Samsung 830 SSD (OS Drive)
i7 3770k
MB: ASUS P8Z77-V
Win 8.1 Pro x64
Things i've tried and none worked:
1. Flashed every single Bios revision and none of them made a difference.
2. Installing/reinstalling/removing drivers and even went native by just using MS built-in driver.
3. Set LinkSpeed and other configuration Manually.
4. Disable IPv6