We need to keep one thread per issue.
I got involved in this thread because it was the only one that mentioned the following issue:
When the Late 2013 apple laptop (mine is a macbook pro 15" retina) running 10.9 (10.9.0, 10.9.1, and 10.9.2 so far) goes to sleep while connected to an 802.11n network (in my case a 5ghz wpa2 network on acisco linksys ea3500) and it wakes up in range of the same network, on wake up it'll behave as though it thinks it is connected to this same network, while being unable to successfully communicate. EG pinging the first hop (router) will time out. This lasts (for me) indefinitely until the aiport is turned off and turned on again, or another network is joined and the original network is rejoined. Other work arounds have been to use a USB or thunderbolt network adapter, either wifi or wired, to reset the router (which disconnects and reconnects as switching networks would), to restart the machine, or just run windows. This seems to be at best because Apple's broadcom drivers don't exactly work for all cases of networks. Limited success is found once-or-twice in resetting the SMC, deleting plists relating to the network location and zapping pram. The wireless networks on which the Late 2013 apple laptops exhibit this behavior, do not exhibit these failings to any other devices, mobile phones, tablets, nor other computers, and otherwise would never need resetting nor replacing nor upgrading, and given that the same hardware could run windows with no other change needed, the routers are not at fault.
Slowdowns, interference, channel hopping, frequency bands and selecting routers doesn't seem to be in the scope of possible contributing issues nor sollutions to the aforementioned. Work arounds involving not using the 10.9.x drivers for this broadcom chipset are, to some extent besides the point.
I'm naming this issue the stuck-wifi-on-wake issue.
Now something odd happened during my upgrade to 10.9.3 that has so far been resolving this issue, which is the only issue I can talk about having had. Let me update another post with that.