Recent update (21 aug) killed my bluetooth somehow. I have no clue. And I am mad.
The only thing — I didn't move my mackbook or even touched it (ext monitors + kbd + wacom + bluetooth mouse).
Rebooting doesn't help.
Anyone?
I also had the same issue with the last Yosemite Update (10.10.5) and only taking the plunge and installing the El Cap Beta fixed it. If the problem is back in El Cap too, I'm a little concerned about doing any updates now.