I thought this topic could also belong in the OS X section but this only happens with my 12" rMB so I want to check with fellow owners here. My mac mini and 13" rMBP does not have this behavior. After my macbook has been sleeping for about 5 minutes or longer, I noticed I have no network and internet connectivity when I wake the laptop. I have to turn off my wifi and then turn it back on. The wifi status shows that I am connected to my access point (also tried it at my parents house with their access point) but no network or internet access is possible. I am not able to access any websites, I can't even ping the router or other local machines on the network. Sometimes if I wait for a few minutes the connectivity returns but I've also had instances where the connection is never working until I disable and re enable the wifi. Anyone have similar issues? I've dug around here and on the apple forums but they are all old threads about mavericks and early yosemite. plus they described a scenario where the wifi shows as disconnected where as my situation shows the wifi is connected.