My problems last week magically solved themselves the day after. I’m not happy about that at all. I rather know what’s broken and how it got fixed, but it seems my wireless network is again stable.
- Make sure Airport is off.
- Remove /Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist (I didn’t care making a backup, up to you)
- Open Keychain Access, and look for anything related to airport. Look for it in all Keychains. If you don’t find anything, you either never used Airport (wireless) or doing it wrong.
- Shutdown your Mac, and reset the PRAM. You do that by pressing the Option-Cmd-R-P keys, all at once, while your machine is booting, and before the grayish screen comes up.