It seems to be a “feature” of the JBL TUNE750 series: they turn off after 5 minutes of no sound, even low-volume music, during conference calls, … to preserve their battery in wireless mode, so you have 2 options:
- Turn them back on when you want.
- Please read this:
[HowTo] become a Manjaro power user when you're a wizard at Windows but a N00b at Manjaro / Linux
Especially the section What’s this Upstream / Downstream business? and then file a bug upstream…
