Sounds possibly like bug 1738838(?). I'm not sure the upstream fix for
that has been released yet, or if it works sufficiently.

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  bluetooth keeps turning off

Status in bluez package in Ubuntu:

Bug description:
  the bluetooth worked well right after install. After a few reboots,
  it's impossible to keep it on and to connect devices.

  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
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr  9 23:24:56 2018
  InstallationDate: Installed on 2018-04-08 (1 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180408)
  InterestingModules: bnep btusb bluetooth
  MachineType: LENOVO 20HHCTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-15-generic.efi.signed 
root=UUID=f6fc1852-25c6-47a6-9776-4ed8b8d6b70e ro quiet splash elevator=noop 
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install) 02/26/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1UET46W (1.20 )
  dmi.board.asset.tag: Not Available 20HHCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0Q40112 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
dmi:bvnLENOVO:bvrN1UET46W(1.20):bd02/26/2018:svnLENOVO:pn20HHCTO1WW:pvrThinkPadP51:rvnLENOVO:rn20HHCTO1WW:rvrSDK0Q40112WIN:cvnLENOVO:ct10:cvrNone: ThinkPad P51 20HHCTO1WW
  dmi.product.version: ThinkPad P51
  dmi.sys.vendor: LENOVO

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