This bug affects me too, and I have the right firmware installed. After
resume, but not every time, the firmware fails to load. See for instance
this output from dmesg | grep -i blue:

[10399.427899] bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-216f.hcd will not 
be loaded
[10399.427901] Bluetooth: hci0: BCM: patch brcm/BCM20702A0-0a5c-216f.hcd not 
found
[10453.386225] Bluetooth: hci0: BCM: patching hci_ver=06 hci_rev=1000 
lmp_ver=06 lmp_subver=220e
[10454.001913] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
[10467.656399] input: Logitech Bluetooth Mouse M555b as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:11/0005:046D:B009.0005/input/input26
[10467.656550] hid-generic 0005:046D:B009.0005: input,hidraw1: BLUETOOTH HID 
v4.16 Mouse [Logitech Bluetooth Mouse M555b] on c4:8e:8f:f4:c3:f6
[10814.998974] Bluetooth: hci0: BCM: patching hci_ver=06 hci_rev=1000 
lmp_ver=06 lmp_subver=220e
[10815.618626] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
[10852.106174] input: Logitech Bluetooth Mouse M555b as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:12/0005:046D:B009.0006/input/input28
[10852.106348] hid-generic 0005:046D:B009.0006: input,hidraw1: BLUETOOTH HID 
v4.16 Mouse [Logitech Bluetooth Mouse M555b] on c4:8e:8f:f4:c3:f6

A workaround is to do 
sudo modprobe -r btusb
sudo modprobe btusb

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https://bugs.launchpad.net/bugs/1356076

Title:
  firmware: fw-04ca_2007.hcd will not be loaded

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