Having the same problem, but found a temporary solution:

If you're using Unity, control the BT switch via the BT tray icon. That
should work.

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https://bugs.launchpad.net/bugs/1286621

Title:
  bluetooth keeps turning off

Status in “bluez” package in Ubuntu:
  Confirmed

Bug description:
  Bluetooth turned off (without me turning it off), as it already
  happened a lot of times.

  Now i can't turn it on.
  I run Bluetooth from the Dash, I turn on Bluetooth with the On/Off button. 
Then it goes back to off.
  It will probably work after reboot.

  Just one more bluetooth bug making bluetooth completely unusable under
  Ubuntu.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: bluetooth (not installed)
  ProcVersionSignature: Ubuntu 3.11.0-17.31-generic 3.11.10.3
  Uname: Linux 3.11.0-17-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  Date: Sat Mar  1 22:21:46 2014
  InstallationDate: Installed on 2013-10-11 (141 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  InterestingModules: bnep rfcomm btusb bluetooth
  MachineType: Acer Aspire V3-571G
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-17-generic 
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: Upgraded to saucy on 2014-02-23 (6 days ago)
  dmi.bios.date: 10/15/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.07
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: VA50_HC_CR
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.07
  dmi.modalias: 
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
  dmi.product.name: Aspire V3-571G
  dmi.product.version: V2.07
  dmi.sys.vendor: Acer
  hciconfig:

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