[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.

Changed settings to Verbose, but did not see any changes in the log when it glitched. But I did something weird at some point:

Code:

   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3122, dts 289970794
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3123, dts 290063673
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3124, dts 290156553
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3125, dts 290249433
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3126, dts 290342313
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3127, dts 290435193
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3128, dts 290528073
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3129, dts 290620952
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3130, dts 290713832
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3131, dts 290806712
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3132, dts 290899592
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3133, dts 290992472
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3134, dts 291085351
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3135, dts 291178231
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3136, dts 291271111
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3137, dts 291363991
   Dec 14 00:57 : decoder_thread: probing plugin ffmpeg
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'ftyp' parent:'root' sz: 28 8 52385894
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: ISO: File Type Major Brand: M4A
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'moov' parent:'root' sz: 8066667 36 52385894
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'mvhd' parent:'moov' sz: 108 8 8066659
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: time scale = 44100
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'trak' parent:'moov' sz: 23362 116 8066659
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'tkhd' parent:'trak' sz: 92 8 23354
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'mdia' parent:'trak' sz: 23262 100 23354
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'mdhd' parent:'mdia' sz: 32 8 23254
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'hdlr' parent:'mdia' sz: 34 40 23254
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: ctype=[0][0][0][0]
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stype=soun
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'minf' parent:'mdia' sz: 23188 74 23254
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'smhd' parent:'minf' sz: 16 8 23180
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'dinf' parent:'minf' sz: 36 24 23180
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'dref' parent:'dinf' sz: 28 8 28
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: Unknown dref type 0x206c7275 size 12
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stbl' parent:'minf' sz: 23128 60 23180
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stsd' parent:'stbl' sz: 88 8 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: size=72 4CC=alac codec_type=1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: audio channels 2
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: version =0, isom =1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'alac' parent:'stsd' sz: 36 8 36
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stts' parent:'stbl' sz: 32 96 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: track[0].stts.entries = 2
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: sample_count=4911, sample_duration=4096
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: sample_count=1, sample_duration=24
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stsc' parent:'stbl' sz: 40 128 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: track[0].stsc.entries = 2
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stsz' parent:'stbl' sz: 19668 168 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: sample_size = 0 sample_count = 4912
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stco' parent:'stbl' sz: 3292 19836 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 0, offset 7b666b, dts 0, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 1, offset 7b668b, dts 4096, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 2, offset 7b66ab, dts 8192, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 3, offset 7b66cb, dts 12288, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 4, offset 7b66eb, dts 16384, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 5, offset 7b670b, dts 20480, size 1886, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 6, offset 7b6e69, dts 24576, size 7547, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 7, offset 7b8be4, dts 28672, size 7116, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 8, offset 7ba7b0, dts 32768, size 6921, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 9, offset 7bc2b9, dts 36864, size 6753, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 10, offset 7bdd1a, dts 40960, size 7145, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 11, offset 7bf903, dts 45056, size 6968, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 12, offset 7c143b, dts 49152, size 6892, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 13, offset 7c2f27, dts 53248, size 6878, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 14, offset 7c4a05, dts 57344, size 6800, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 15, offset 7c6495, dts 61440, size 6776, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 16, offset 7c7f0d, dts 65536, size 6648, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 17, offset 7c9905, dts 69632, size 8253, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 18, offset 7cb942, dts 73728, size 7569, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 19, offset 7cd6d3, dts 77824, size 7318, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 20, offset 7cf369, dts 81920, size 7132, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 21, offset 7d0f45, dts 86016, size 7328, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 22, offset 7d2be5, dts 90112, size 7195, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 23, offset 7d4800, dts 94208, size 7298, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 24, offset 7d6482, dts 98304, size 7370, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 25, offset 7d814c, dts 102400, size 7522, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 26, offset 7d9eae, dts 106496, size 7510, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 27, offset 7dbc04, dts 110592, size 7784, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 28, offset 7dda6c, dts 114688, size 8013, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 29, offset 7df9b9, dts 118784, size 7978, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 30, offset 7e18e3, dts 122880, size 8039, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 31, offset 7e384a, dts 126976, size 8181, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 32, offset 7e583f, dts 131072, size 8294, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 33, offset 7e78a5, dts 135168, size 8584, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 34, offset 7e9a2d, dts 139264, size 8567, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 35, offset 7ebba4, dts 143360, size 8817, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 36, offset 7ede15, dts 147456, size 8904, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 37, offset 7f00dd, dts 151552, size 9121, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 38, offset 7f247e, dts 155648, size 9212, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 39, offset 7f487a, dts 159744, size 9773, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 40, offset 7f6ea7, dts 163840, size 9508, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 41, offset 7f93cb, dts 167936, size 9518, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 42, offset 7fb8f9, dts 172032, size 9832, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 43, offset 7fdf61, dts 176128, size 9826, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 44, offset 8005c3, dts 180224, size 9711, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 45, offset 802bb2, dts 184320, size 9818, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 46, offset 80520c, dts 188416, size 9485, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 47, offset 807719, dts 192512, size 9724, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 48, offset 809d15, dts 196608, size 9459, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 49, offset 80c208, dts 200704, size 9521, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 50, offset 80e739, dts 204800, size 9432, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 51, offset 810c11, dts 208896, size 9481, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 52, offset 81311a, dts 212992, size 9820, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 53, offset 815776, dts 217088, size 9662, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 54, offset 817d34, dts 221184, size 9700, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 55, offset 81a318, dts 225280, size 9471, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 56, offset 81c817, dts 229376, size 9708, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 57, offset 81ee03, dts 233472, size 9562, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 58, offset 82135d, dts 237568, size 9526, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 59, offset 823893, dts 241664, size 9623, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 60, offset 825e2a, dts 245760, size 9403, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 61, offset 8282e5, dts 249856, size 9465, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 62, offset 82a7de, dts 253952, size 9124, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 63, offset 82cb82, dts 258048, size 9117, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 64, offset 82ef1f, dts 262144, size 8922, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 65, offset 8311f9, dts 266240, size 8855, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 66, offset 833490, dts 270336, size 8763, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 67, offset 8356cb, dts 274432, size 8625, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 68, offset 83787c, dts 278528, size 8622, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 69, offset 839a2a, dts 282624, size 8634, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 70, offset 83bbe4, dts 286720, size 8719, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 71, offset 83ddf3, dts 290816, size 8784, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 72, offset 840043, dts 294912, size 8581, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 73, offset 8421c8, dts 299008, size 8420, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 74, offset 8442ac, dts 303104, size 8406, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 75, offset 846382, dts 307200, size 8294,