Apple - Bluetooth Issues after Sleep in OS X Yosemite (10.10)

I've had issues reconnecting my bluetooth keyboard & trackpad since upgrading to Yosimite.

First try this: Open Terminal & run 2 commands:

sudo kextunload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport

sudo kextload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport

I only had to run above once. If later bluetooth breaks again 2 options, simply run above again or you can create a 1-click solution with a simple app using Automator:

1. Search for (Spotlight search) and run Automator
2. Click "New Document" at bottom
3. Choose "Application" for new file type
4. Click on "Utilities" from list
5. Double-Click "Run AppleScript"

6. Replace (* Your script goes here *) with:

   do shell script "kextunload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport; 
   kextload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport" with administrator privileges
   

7. Press play to test (will prompt for password)
8. File->Save to desktop or wherever

Run the automator app whenever bluetooth devices won't connect

Mikaey's solution on the apple support forum:

1. Turn your WiFi off
2. Try re-connecting to your bluetooth devices (should work)
3. Turn WiFi back on

This has solved the issue for me.

After trying to run the scripts suggested by other answers, unloading and reloading both the kext and the bluetooth daemon, my bluetooth still wasn't responding.

However, I have discovered that if Yosemite sleeps with VMWare running and bluetooth doesn't work when the OS is woken up, closing VMWare rectifies the issue.

It seems that the drivers in VMWare don't always handle the sleep / wake process correctly.