Ethernet problem on wake since 10.11.2

Since I installed the latest (10.11.2) El Capitan update, when my late 2013 27" iMac wakes, intermittently the network does not work (browser can't load a URL, Mail doesn't work, etc). It's not just DNS as entering IP addresses doesn't work either. The machine is connected over Ethernet, not wifi, and the wifi is turned off. The machine has a fixed IP address on my home network, and does not use DHCP.

When the failure happens, if I disconnect the Ethernet cable from the back of the Mac and immediately reinsert it, network functionality is restored. This machine has worked flawlessly in this mode since I purchased it in March of 2014; this is the first time I've seen such problems when waking it up. I typically put it to sleep using Option+Cmd+Eject or let it go to sleep on its own. The intermittent failure on waking seems to be independent of how it went to sleep.

Anyone have any ideas what else I might try?