No Wifi Networks after Sleep
I'm running Mavrics for a while and all has been good. But lately after long sleep on my Macbook Pro (17" early 11) no wifi networks are available on the interface list. When I restart, they re-appear (most of the time).
I've tried creating a new network location, turned wifi on and off, even deleated the preferences in the library, but no luck.
I'm an engineer and this has got me stumped.
Thanks in advance!
MacBook Pro, OS X Mavericks (10.9)