Since upgrading to Yosemite (did a wipe of my HD before installing, so no settings was there from Mavericks) I can only connect my Magic Mouse normally once per boot.
Normally you would be able to connect the mouse, sleep the computer, connect the mouse again, however I have to reboot my MacBook Pro after the sleep, if I want the Magic Mouse to work again.
I can see the device in both the Bluetooth preference pane and the Bluetooth menubar icon dropdown, but clicking connect in either of them does nothing.
Sometimes deleting the pairing and re-pairing with the mouse works, however most of the time it doesn't.
I have tried to reset my nvram and deleting
/Library/Preferences/com.apple.Bluetooth.plist, without any success.
When using Mavericks and below, I have never had any issue with my Magic Mouse and the problem still exist when using a different Magic Mouse on Yosemite.
Any suggestion on how to fix this, without downgrading to Mavericks?