My 2011 MacBook Pro is running High Sierra and has a WiFi problem. It stops working after a few minutes and shows "No wifi hardware installed" after reboot. A PRAM / NVRAM reset sorts this out until the next time. SMC reset also temporarily solves the problem.
The computer also has Windows and Ubuntu installed and the wifi works fine in both. Does anyone know a fix for this?
Normally I would just update to fix most Apple problems but the latest update (2018-001) won't install as it will render the Bootcamp partition unbootable!
Best Answer
I would start with something simple and boot into Safe Mode and test how well your Wi-Fi works while in Safe Mode.
Follow these steps::
The act of booting into Safe Mode will actually perform a number of background tasks, and this often resolves issues when you've rebooted normally.
Once you've tried the above let me know how you go.
[Update 1]
Since we've established the issue is still present during Safe Mode and that it still keep recurring after resetting NVRAM, let's next test your hardware for signs of any problems.
Run Apple Hardware Test
Your model MBP uses Apple Hardware Test. To use this, follow these steps:
Note 1: that the extended test will take some time. Take a note of the results and report back.
Note 2: If pressing and holding the D key at Step 3 doesn't work, start again at Step 1 and, at Step 3 press and hold both the OptionD keys instead. This will try and run diagnostics from the internet instead, so you will need to allow more time for it to complete.
[Update 2]
Another option worth trying is to remove your Wi-Fi service, restart, and add your Wi-Fi service back.
To do this:
Let me know how you go.