FYI, I have this exact same issue and have been having it for months. It is seemingly random. Happens to random songs, at random points in the song, at random intervals.
As in OP, the playback bar keeps playing, the equalizer goes flat, no sound output, hitting pause/play doesn't restart the song, but going to a previous song and back to the silenced song has it start outputting sound. I've never had the song get silenced again immediately after doing so.
Version
3.4.7805