Bluetooth broke on me:

https://bbs.archlinux.org/viewtopic.php?id=204875 2015 November

https://bbs.archlinux.org/viewtopic.php?id=206032 2015 December

https://bbs.archlinux.org/viewtopic.php?id=210685 2016 March.

And these were times when I needed community help, most of the time I could get it working by pairing again or some such nonsense. It never worked reliably, in general.

Note I switched to Windows as my daily driver in 2018 January.

It seems sound is still a gigantic mess of PulseAudio and ALSA https://wiki.archlinux.org/index.php/PulseAudio