I have this on numerous 4.13 and 4.14 kernels from synaptic (17.10 repos) and 
ubuntu-mainline ppa.
IE today: 
4.14.17-041417-generic #201802031230 SMP Sat Feb 3 17:31:50 UTC 2018 x86_64 
x86_64 x86_64 GNU/Linux

This is on a 5th get lenovo x1 carbon using the built-in bluetooth and a
few different bt mice, IE HP and Verbatim.

The rfkill block/unblock commands above did nothing for me.

cpu is eating my battery and the only process is "kworker"

 2615 root      20   0       0      0      0 R  85.3  0.0   6:02.78 kworker/0:2 
 3365 root      20   0   45376   3928   3260 R   0.3  0.0   0:00.04 top         
    1 root      20   0  220176   8432   6316 S   0.0  0.1   0:02.59 systemd     
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kthreadd    
    4 root       0 -20       0      0      0 I   0.0  0.0   0:00.00 
    6 root       0 -20       0      0      0 I   0.0  0.0   0:00.00 
powertop says...

The battery reports a discharge rate of 18.6 W
The estimated remaining time is 2 hours, 26 minutes

Summary: 655.9 wakeups/second,  0.0 GPU ops/seconds, 0.0 VFS ops/sec and
5.6% CPU use

                Usage       Events/s    Category       Description
             80.0%                      Device         Display backlight
              6.1 ms/s     256.3        Interrupt      [9] acpi
             23.8 ms/s     233.4        kWork          acpi_os_execute_deferred
              2.7 ms/s      67.4        Process        /usr/lib/xorg/Xorg -core 
:0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolis
              1.0 ms/s      25.4        Process        lxterminal
            445.6 µs/s      13.9        Interrupt      PS/2 Touchpad / Keyboard 
/ Mouse
             42.0 µs/s      13.5        Process        [xfsaild/nvme0n1]
            442.2 µs/s      12.2        Process        lxpanel --profile Lubuntu

I have to reboot to clear it!

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-firmware in Ubuntu.

  [Intel 8260/8265] Bluetooth peripherals work for a few seconds, then
  don't react

Status in linux package in Ubuntu:
Status in linux-firmware package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
Status in linux-firmware source package in Xenial:
  Fix Released
Status in linux source package in Artful:
Status in linux-firmware source package in Artful:
  Fix Released

Bug description:
  SRU Justification

  Impact: Bluetooth peripherals work initially but stop working shortly
  with Linux 4.13.

  Fix: Updated firmware from Intel containing a fix for the issue.

  Regression Potential: Any firmware updates may bring regressions,
  however this is a bug fix update and therefore regression potential is
  expected to be minimal.


  After upgrading from Ubuntu Gnome 17.04 to Ubuntu 17.10, bluetooth
  mouse and keyboard connects, works for a few seconds, then doesn't

  Bluetooth package version: 5.46-0ubuntu3 500

  Please tell me which log-files to upload.

  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 17.10
  InstallationDate: Installed on 2016-06-11 (509 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Release amd64 
  InterestingModules: rfcomm bnep btusb bluetooth
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 006: ID 04b4:5210 Cypress Semiconductor Corp.
   Bus 001 Device 005: ID 8087:0a2b Intel Corp.
   Bus 001 Device 002: ID 13d3:5664 IMC Networks
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 80MK
  Package: bluez 5.46-0ubuntu3
  PackageArchitecture: amd64
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic 
root=UUID=ed8fbe48-3db5-4a77-ab34-f35fd1a481cc ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Tags:  artful wayland-session
  Uname: Linux 4.13.0-16-generic x86_64
  UpgradeStatus: Upgraded to artful on 2017-10-23 (11 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 03/01/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: C6CN37WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: VIUU4
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo YOGA 900-13ISK
  dmi.product.family: IDEAPAD
  dmi.product.name: 80MK
  dmi.product.version: Lenovo YOGA 900-13ISK
  dmi.sys.vendor: LENOVO
   hci0:        Type: Primary  Bus: USB
    BD Address: A4:34:D9:9A:CD:FF  ACL MTU: 1021:4  SCO MTU: 96:6
    RX bytes:71005 acl:1028 sco:0 events:2920 errors:0
    TX bytes:601922 acl:36 sco:0 commands:2468 errors:0

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