Why is there no sound on my smartphone when I listen to the Walkman?

Question

Software players

Question for connoisseurs and experts. Your versions, gentlemen!
In the Sony Xperia 3E LTE smartphone bought 2 weeks ago, there is such a glitch: when listening to music, periodically, about once every 20 minutes, the sound disappears for 5-10 seconds, and then reappears as if nothing had happened. During the audio cut-out, the song does not stop, the slider in the Walkman continues to move. I tried to turn off the economical modes, which the Xperia 3E does not help. Today I decided to try to disable packet data transfer (completely). I listened for about 35 minutes, there was no glitch. But you can't say for sure what it is. What do you think. I tried to transfer music from a flash card to internal memory - this did not give any effect.
What do you think, gentlemen?