Bluetooth and Wi-Fi there are two things with problems that Apple does not seem to be able to resolve in OS X updates in the first beta version of 10.11.2 the company is again asking developers to focus their tests on Wi-Fi, for example.
Here on my Mac, for example, my Wi-Fi is very unstable (I often need to disable / enable Wi-Fi to get everything back to working as it should). Bluetooth, after some instabilities (the Magic Mouse disconnected and connected itself a few times a day), everything is working fine now. But if you are still experiencing connectivity issues with Bluetooth and have tried everything, know that there is a way to reset your settings.
- If you already have the Bluetooth icon in the menu bar, skip to item 2; if not, go to Bluetooth System Preferences and activate the option ?Show Bluetooth in the menu bar? (at the bottom).
- With the keys (Shift) and (Option) pressed, click on the Bluetooth icon in the menu bar and choose the option Debug Remove all devices.
- Repeat step 2, but now choose the option ?Reset the Bluetooth module?.
- Restart your Mac.
- Reconnect and pair all accessories, as if you were doing it for the first time.
Okay, now hope that everything works again as it should.
(via Mac Kung Fu)