Comment 34 for bug 1449730

Cosmin, the ath3k module is the firmware loader for Atheros bluetooth devices. For whatever reason the firmware loader wasn't integrated into btusb like it is for Broadcom and Intel. If you do have wireless disconnects with a working bluetooth you may need to enable the bluetooth coexistance in the ath9k module with

echo "options ath9k btcoex_enable=1" | sudo tee /etc/modprobe.d/ath9k.conf

Reboot