I have a 2012 15 rMBP (when they first came out). I've noticed lately that my wifi often won't connect after I wake it from sleep (when I open lid). Every time it will search for a long time, sometimes it finds it, sometimes it says it can't find it. But when I turn off wifi and turn it on, it quickly finds the connection. Does anyone else have this problem or know if it's a fixable issue? Or is it covered in another thread (I didn't see one). Thanks for any help!