This used to happen here...not quite sure why it doesn't anymore, but I had 2 workarounds, the 1st of which was the easiest, but didn't always work:
a] Control Panel\Network and Sharing Center
b] on the left pane, click Change Adapter Settings
c] Right click on the problem connection
d] Choose 'disable'
e] wait 30 seconds, right click and re-enable.
a] Shutdown system(s)
b] Unplug power from modem, router and/or network switches
c] Wait 30 seconds, plug in modem, wait for complete powerup routine, plug in router, wait for P.U. routine, same for any other devices
d} Boot machine.
Again, I'm not sure why I no longer have this issue, it just went away, but more often than not, method 1 worked and took very little time (certainly much less than #1...)