still without a solution? i can't believe it, i'm with 10.11.6 and still with this bug, already tried 3 different routers and wireless configurations, no doubts that is a card problem with macos
For what it's worth, I was having 0 problems with wifi on 10.12.1, then one day seemingly all went to hell -- limited/no connectivity, all sorts of problems. Tried everything then randomly found a thread somewhere that suggested deselecting the "Wake for Wi-Fi network access" option under Energy Saver prefs and *voila* immediate (and I mean immediate - no logout, no reboot) fix. Bandwidth is solid, connectivity solid... hopefully it takes, and good luck everyone!