[PROBLEM] Audio glitches (dropouts, clicks and pops) using USB DAC plugged to Pi Zero W

[pardon]

Here's the output

Dec 13 21:38 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 13 21:42 : player: played "SDCARD/03 Below The Clavicle.m4a"
Dec 13 21:48 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 13 21:52 : player: played "SDCARD/01 Airborne Ashes.m4a"
Dec 14 00:46 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 14 00:46 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set

Radio streams glitches too!. Also, glitches are highly irregular, sometimes a few every five seconds, something none for 2 minutes.