My Wifi connection keeps dropping after El Capitan update

Please test after taking each of the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.

Step 1

Take the applicable steps in this support article.

Step 2

The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.

Be sure to test on more than one Wi-Fi network, if at all possible. A desktop computer can be tested with a mobile hotspot, such as the hotspot created by a cell phone. If the problem only exists on one network, then the access point of that network should be the focus of your attention, not the computer.

Step 3

Disconnect all USB 3 devices, and also all external displays if the Mac has one built in. If you don't know which devices are USB 3, disconnect all USB devices except keyboard and mouse.

Step 4

If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. If you find that Wi-Fi works better with Bluetooth disabled, you should use the 5 GHz Wi-Fi band. Your router may not support it; in that case, you need a new router.

Step 5

Open the Energy Saver pane in System Preferences and unlock the settings, if necessary. Select the Power Adapter tab, if there is one. Uncheck the box marked

Wake for Wi-Fi network access

if it's checked.

Step 6

Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.

Step 7

In the Wi-Fi settings, select

Advanced... ▹ TCP/IP ▹ Configure IPv6: Link-local only

Click OK and then Apply.

Step 8

Reset the System Management Controller.

Step 9

Reset the PRAM.

Step 10

Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first. Turn Wi-Fi off and then back on. You'll be prompted for the password when you reconnect. Save it in the keychain.

Step 11

Reinstall the OS. The linked support article refers to OS X 10.10 ("Yosemite"), but the procedure is the same for OS X 10.7 ("Lion") and later.

Step 12

Make a "Genius" appointment at an Apple Store, or go to another authorized service center.

The accepted answer is not an acceptable answer.

It performs a lot of religious troubleshooting steps that have nothing to do with wi-fi and will not fix the reported problem.

Step 7 disables IPV6, which on some networks, will result in no network connection. Especially for Comcast customers.

Running wireless diagnostics literally does nothing even related to resolving the reported problem. All it does is store a bunch of information about network settings that will take up space on the local disk and never be used.

Resetting PRAM hasn't done anything to fix any problem since the Mac Classic.

Deleting all of your network credentials will not fix the problem and in fact will make it worse because now you have to re-enter all your wifi credentials over again.

Re-installing the OS does nothing. This is not Windows 95. Re-installing the OS will put the same bug that caused the problem back into the same system.

Apple need to resolve this problem. The above is not the answer. The answer is for Apple to fix this bug. The easiest way is to restart the computer (@ the moment) that is until or unless Apple are able to resolve this problem.