same problem on Lenovo x1 carbon 1st gen
0a5c:21e6
 9903.370351] usb 1-1.4: new full-speed USB device number 9 using ehci-pci
[ 9903.467690] usb 1-1.4: New USB device found, idVendor=0a5c, idProduct=21e6
[ 9903.467697] usb 1-1.4: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[ 9903.467701] usb 1-1.4: Product: BCM20702A0
[ 9903.467705] usb 1-1.4: Manufacturer: Broadcom Corp
[ 9903.467708] usb 1-1.4: SerialNumber: 7CE9D3E9491F
[ 9903.475850] Bluetooth: hci0: BCM: chip id 63
[ 9903.491894] Bluetooth: hci0: BCM20702A
[ 9903.492904] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[ 9906.994358] Bluetooth: hci0 command 0x1001 tx timeout
[ 9914.990488] Bluetooth: hci0: BCM: Reading local version info failed (-110)
[ 9916.994516] Bluetooth: hci0 command 0x0c03 tx timeout
[ 9924.990576] Bluetooth: hci0: BCM: Reset failed (-110)

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https://bugs.launchpad.net/bugs/1483101

Title:
  Broadcom bluetooth modules sometimes fail to initialize

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