Problem seems resolved with bluez 5.48.2 as outlined in this bug:

** Bug watch added: Red Hat Bugzilla #1534857

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  Bluetooth doesn't reconnect to my headsetup post resume from sleep

Status in bluez package in Ubuntu:

Bug description:
  Steps to repro:

  * Cold boot the laptop
  * Pair it with bluetooth headset
  * Listen to music
  * Turn off the headset or turn off the bluetooth on the laptop
  * Play music, sound comes out of the laptop speakers
  * Turn on the headset back on or the bluetooth on the laptop
  * Headset reconnects with the laptop and audio plays from the headset

  -- all the above is expected --

  * Suspend the laptop
  * wait a minute or two for the headset to power down
  * Resume the laptop
  * Turn on the bluetooth headeset
  * It doesn't automatically reconnect to the laptop (not expected behaviour)
  * Launch Gnome Settings and select Bluetooth and force the headset to connect
  * It connects for 2 seconds then disconnects (not expected behaviour)

  The only to get the headset to reconnect again is by restarting the
  bluetooth.service using systemctl.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bluez 5.48-0ubuntu3
  ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Wed Apr 11 15:28:28 2018
  InstallationDate: Installed on 2018-04-03 (8 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180403)
  InterestingModules: rfcomm bnep btusb bluetooth
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 138a:0091 Validity Sensors, Inc. 
   Bus 001 Device 002: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 004: ID 1bcf:2b95 Sunplus Innovation Technology Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 15 9560
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic.efi.signed 
root=UUID=1f5de204-14c1-4ab7-b29c-880bbcd6f1d9 ro quiet splash 
nouveau.modeset=0 vt.handoff=1
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install) 01/25/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.7.1 0JHP5H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvr1.7.1:bd01/25/2018:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn0JHP5H:rvrA00:cvnDellInc.:ct10:cvr: XPS XPS 15 9560
  dmi.sys.vendor: Dell Inc.
   hci0:        Type: Primary  Bus: USB
        BD Address: F8:34:41:D4:8F:36  ACL MTU: 1021:4  SCO MTU: 96:6
        RX bytes:19284 acl:106 sco:0 events:2607 errors:0
        TX bytes:605507 acl:103 sco:0 commands:2473 errors:0

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