I have to correct my earlier statement (comment 14), the linux-firmware
package update didn't fix the problem after all - it seemed to work for
a while, but I was mistaken. Now, however, I've gotten it working. The
correct fix is to add the following line to the end of

options iwlwifi bt_coex_active=0

After a reboot, you can test if the option is enabled with

cat /sys/module/iwlwifi/parameters/bt_coex_active

(Should return 'N').

Since I added that option, I haven't had any further issues with my Sony
Bluetooth Speaker (or WiFi).

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  Bluetooth audio to A2DP headset no longer works following upgrade from
  4.12 to 4.13 in artful

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