If you're using 16.04 then there have been no high-level bluetooth-
related updates at all recently:

 bluez 5.37-0ubuntu5 ... 2016-03-09
 pulseaudio 1:8.0-0ubuntu3.3 ... 2017-06-30

So if your system was working for the previous month or more then the
problem is not caused by bluez or pulseaudio at least.

You might want to assign it to "linux (Ubuntu)" in case it was caused by
a recent kernel update like:

 linux 4.4.0-91.114 ... 2017-08-07

which sounds more likely by the date.

** Changed in: bluez (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1710941

Title:
  Bluetooth stopped working after update

Status in bluez package in Ubuntu:
  Invalid

Bug description:
  Bluetooth connection to Bose Soundlink II have been fine for years.
  Applied a few new updates in the last day or two --- system was
  generally up to date, I don't often wait more than a week or so ---
  and now I can no longer connect.  Removed the device and re-paired
  just fine, although the speaker did not connect as it usually does
  after the pairing (i.e., it stayed in pairing mode).

  Messages in syslog:

  Aug 15 20:32:07 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:32:07 n1 bluetoothd[1075]: GLib: Source ID 276 was not found when 
attempting to remove it
  Aug 15 20:32:11 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:32:42 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:32:42 n1 bluetoothd[1075]: GLib: Source ID 287 was not found when 
attempting to remove it
  Aug 15 20:32:46 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:33:07 n1 bluetoothd[1075]: connect error: Host is down (112)
  Aug 15 20:33:07 n1 bluetoothd[1075]: GLib: Source ID 305 was not found when 
attempting to remove it

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: bluez 5.37-0ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
  Uname: Linux 4.4.0-91-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Aug 15 20:34:34 2017
  InstallationDate: Installed on 2015-12-26 (597 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  InterestingModules: rfcomm bnep btusb bluetooth
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-91-generic 
root=UUID=5950fbba-cde1-49ac-a918-04e517894c57 ro quiet splash vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: Upgraded to xenial on 2017-02-28 (168 days ago)
  dmi.bios.date: 01/18/2017
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0362.2017.0118.0940
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-504
  dmi.chassis.type: 3
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0362.2017.0118.0940:bd01/18/2017:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-504:cvn:ct3:cvr:
  hciconfig:
   hci0:        Type: BR/EDR  Bus: USB
        BD Address: DC:53:60:97:55:17  ACL MTU: 1021:5  SCO MTU: 96:6
        UP RUNNING PSCAN 
        RX bytes:6896 acl:46 sco:0 events:294 errors:0
        TX bytes:4254 acl:32 sco:0 commands:156 errors:0
  mtime.conffile..etc.bluetooth.main.conf: 2015-12-29T07:24:08.439240

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