I have a Macbook Pro (late 2011) with the latest OS X (10.9.4) and once in a while the Bluetooth subsystem disappears and the system hangs for a few seconds every ~10 minutes. The icon in the menu bar looks like this:
And there is no Bluetooth system preference anymore:
This happens once every 2-3 days and I have no idea what the cause could be.
Question: How can I restart the bluetooth subsystem from the command line to make it available again? Or (more interesting of course) what is the cause of this infrequent hang and how can I heal it completely?
I cannot remember which software I've installed at the time the error started to show, it might have been bootcamp to support a 32 bit windows in a virtual machine or some Citrix software (Citrix Access Gateway)