This is a problem I've been having for months on and off. Apple won't help (because, of course, it doesn't happen when it's in front of an Apple Genius). But perhaps MR can help. Simple question: what could be causing my MBP to lose connection to my wifi and then not be able to find ANY wifi networks in my area (of which there are usually about a dozen)? I've attached two images - on the right is what happens when it loses connection and then simply won't find anything.