My JBL flip doesn't play sound sometimes

I use it regularly, no problem when I use it with my phone, nor after I restart my laptop. After a while it stops emitting audio. The playback device indicates that sound should be playing, even tests are visual, but no music. Seems very specific and haven't seen a similar case online.

I guess it's software-related. I tried:

-bluetooth module restart

-pairing it off and on

-turning on and off the flip