I found the following instructions for installing the latest Broadcom driver 17.2.0.0, and this seems to have solved my problem.  After downloading and extracting the zip file NetLink®/NetXtreme® I Desktop/Mobile/Server (x64): 1. Go to Network Settings and click Change Adapter Options 2. Right-click on the Ethernet/Local Area Connection device and select Properties 3. Click on Configure and go to the Drivers Tab 4. Click on Update Driver and then select Browse My Computer 5. Select "Let me pick from a list..." and then select Have Disk 6. Locate the downloaded driver file (b57nd60a.inf) and select OK 7. You will now see a long list of drivers: Select Broadcom Netlink (TM) Gigabit Ethernet (about 1/3 of the way down on my list). 8. Click Next and you should be good to go! I applied this update three days ago and my Ethernet connection has worked perfectly since then. I'll update this post if any problems arise, but so far its looking good.
I recently upgrade my XPS 8100 from Windows 7 to Windows 10. Since the upgrade, the ethernet adapter is periodically getting disabled.  I can use the Windows troubleshooting wizard to re-enable the adapter, but the problem comes back once or twice per day.  Has anyone else seen this problem and found a solution ?  I am not running any 3rd-party security software.
Windows 10 Upgrade Disables Broadcom Ethernet Adapter