So, I have this 13'' MBP Retina (Late 2012) and it will sometimes connect to the WiFi, but after the screen is closed for a little while, or even after I use it for not that long, it will say there is a conncection issue (Alert: No Connection), and I will get half way through the diagnostics, and it will say: there has been a network change) and it will be ok for about 10 seconds, then it loses connection again! It will sometimes do this multiple times, so I have to go to the router and reset it. Then after a longer period of time, it will quit working! I really need help ASAP!
I dunno much but hope these will help:
Baby Boomer (USofA) wrote:
"Do the following:
In the Library/Preferences/SystemConfiguration/ folder delete the following:
You will have to re-configure all your network settings since deleting"
Check out the above two and see if it works