Just to note that I had similar problems that were solved by cyano's suggestion 
in #32
(Using Ubuntu 16.04 LTS with a cheap CSR8510 chip USB bluetooth dongle and 
Clarity bluetooth speaker.)

sudo btmgmt le off

Then using the standard Bluetooth Settings app deleted the current
connection from the list of devices and remade the connection.  This
resolved the problem.

However, in order to get the speaker to appear in the list of output
devices in Sound Settings I find I always have to switch the bluetooth
connection to the Clarity speaker on, then off, then on again at the
start of a session (using the Bluetooth notification area drop-down).
After that, it's fine for the remainder of the session.

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Packages, which is subscribed to bluez in Ubuntu.
https://bugs.launchpad.net/bugs/1490349

Title:
  15:10 and 16.04: bluetoothd reports "Not enough handles to register
  service" at start

Status in bluez package in Ubuntu:
  Confirmed

Bug description:
  On 15:10 after the bluetooth service has been stopped and restarted it
  is not possible to scan or connect to devices:

  $ sudo systemctl start bluetooth
  $ journalctl --unit=bluetooth | tail -n 19 | awk '{$1="";$2="";$4="";print 
$0}'
    23:31:53  systemd[1]: Starting Bluetooth service...
    23:31:53  bluetoothd[16647]: Bluetooth daemon 5.33
    23:31:53  systemd[1]: Started Bluetooth service.
    23:31:53  bluetoothd[16647]: Starting SDP server
    23:31:53  bluetoothd[16647]: Bluetooth management interface 1.9 initialized
    23:31:53  bluetoothd[16647]: Failed to obtain handles for "Service Changed" 
characteristic
    23:31:53  bluetoothd[16647]: Not enough free handles to register service
    23:31:53  bluetoothd[16647]: Error adding Link Loss service
    23:31:53  bluetoothd[16647]: Not enough free handles to register service
    23:31:53  bluetoothd[16647]: Not enough free handles to register service
    23:31:53  bluetoothd[16647]: Not enough free handles to register service
    23:31:53  bluetoothd[16647]: Current Time Service could not be registered
    23:31:53  bluetoothd[16647]: gatt-time-server: Input/output error (5)
    23:31:53  bluetoothd[16647]: Not enough free handles to register service
    23:31:53  bluetoothd[16647]: Not enough free handles to register service
    23:31:53  bluetoothd[16647]: Sap driver initialization failed.
    23:31:53  bluetoothd[16647]: sap-server: Operation not permitted (1)
    23:31:53  bluetoothd[16647]: Endpoint registered: sender=:1.440 
path=/MediaEndpoint/A2DPSource
    23:31:53  bluetoothd[16647]: Endpoint registered: sender=:1.440 
path=/MediaEndpoint/A2DPSink

  And

  $ bluetoothctl
  [NEW] Controller 00:1F:3A:E0:0A:AF hephaestion.lan.iam.tj [default]
  [NEW] Device 00:0A:95:4B:BD:C2 Apple Wireless Keyboard
  [NEW] Device 00:07:61:3B:86:98 Bluetooth Travel Mouse
  [bluetooth]# scan on
  Failed to start discovery: org.bluez.Error.NotReady

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