Disclaimer: I tried this workaround and it fixed my Wi-Fi Disconnecting issue after installing the update OS X 10.10.2 via Mac App Store. So thought to share it here to help people fix WiFi disconnecting problem.
I am using iMac 27 Inch 2014 model and today morning i updated to OS X 10.10.2. I never had WiFi related issues since i bought mac, for the first time i faced this issue and it was so frustrating. Some time ago when apple rolled out 10.9.4, mac users reported WiFi frequent disconnect issue and not able to connect to any WiFi router, even it sits right next to their mac computer.
Apple rolled out OS X 10.10.2 Yosemite update to address Wi-Fi Disconnect issue, web pages slow loading issue, spotlight problem, bluetooth headphones not syncing issue and so on. You can read about the update details from apple website.
After updating to OS X 10.10.2 my mac wifi connection frequently drops. checked the router status and it was connected and working fine on my iPhone. So figured out that its the problem with the latest OS X Yosemite update. So i tried a workaround and it works for me. The WiFi stays stronger and works like before without any problem. As apple promises with the update, webpages loads faster and smoother without any trouble.
Solution #1: OS X WiFi Disconnect Issue Fix
Lets discuss the steps involved.
Step 1: Go to “Network Preferences” and select the WiFi Network you have connected with your Macbook or iMac.
Step 2: Delete that network from the list by selecting “-” icon below the list.
Step 3: Now Restart your Mac and once Desktop loaded, visit “Network Preferences” tab or click on “WiFi” icon to see the list of networks to connect.
Step 4: Now connect your WiFi Router by selecting the Router SSID, if its an Hidden Network then select “Join Other Network” and proceed with the details to connect to your WiFi.
Solution #2: Revert WiFi Driver to OS X 10.10.1 version
Well, it is not possible by everyone to revert back to OS X 10.10.1 after updating to OS X 10.10.2. Apple should really give an easy way to revert the OS X version understanding they sometimes screw up the users mac computer in the name of updates and thinking everyone who owns a mac owns an Apple Time Machine. But here we have an unofficial workaround to get the WiFi Driver version rollback done from OS X 10.10.2 to OS X 10.10.1. The actual credit goes to Lysin and HKWAY for coming up with the solution.
Lets revert WiFi Driver version on Mac OS X. The Steps Involved are,
Step 1: Exit or Turn Off WiFi Connectivity completely before replacing the newer version with older version of WiFi Driver.
Step 2: Go to “/System/Library/Extensions” and take a backup of “IO80211Family.kext” file by saving it in someplace safer in your local hard disk drive.
Step 3: Download the older version OS X 10.10.1 WiFi Driver version from the link and extract the compressed file to find “IO80211Family.kext” file.
Step 4: Copy and Paste it in the Extensions directory and when it prompt for replacing the file, select “replace” and finish the replacing of WiFi Driver file.
Step 5: Reboot your Mac once and Turn on WiFi from the top right corner of your Mac desktop and connect to your WiFi Router. If it prompts for a Password, then enter and save the settings.
If you have any trouble with the WiFi settings, make sure to restore the backup file which you have saved at Step 2.
Once connected, you should see WiFi Connectivity is pretty stable and there are no issues with the WiFi connection at all. As it mentioned in the update details list, the webpages and youtube videos should load faster and smoother on your web browser.
Solution #3: How to Reinstall OS X Yosemite?
Well, if above 2 solutions didn’t work for you or WiFi Driver corrupted after you rebooted the mac, then consider Reinstalling OS X Yosemite 10.10 to your Mac. Reinstallation of OS X Yosemite replaces all the systems and leaves the Files, Documents, Apps Installed unchanged. So you dont have to worry about any data loss. But as a safety measure it is always recommended to take a backup copy of important files and documents to secondary hard disk drive.
Time Machine Backup: If you have setup Time Machine, then you can instantly rollback to OS X Yosemite 10.10.1 version and ignore all these three steps suggested above.
Thanks for reading and if the solution recommended here didn’t fix your WiFi problem, then share more details in comment box below and let us try some other ways to fix it. Also for any Mac OS X, Windows and Android related questions ask it in our DailyTUT Answers section. Have a Productive Day.