I have experienced this also. I don't think it is something tied to the actual environmental sound, but instead the volume of the content being played. I tested it on the same song at different volume levels. At a particular point as the song goes into a dynamic chorus, listening at higher volumes with ANC or Relieve Pressure causes the deep and full bass to cut out. Repeating that same section of the song at a lower volume keeps the bass intact. I can accurately repeat these conditions every time, so it appears it's not quite a random fluctuation in the bass but rather a limit to when it stays active. What triggers the threshold is something I hope Samsung looks into and fixes.
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