I noticed this by accident when switching files frequently. I will explain the method by which you can quickly reproduce this. You need to make two half-second files in Audacity. In the MPC player, drag any file and continuously play the entire directory. After 1-2 minutes the sound from the DAC disappears. The I2S bus is silent. but you can still change the sample rates in the mixer. 
I noticed this by accident when switching files frequently.
I will explain the method by which you can quickly reproduce this.
You need to make two half-second files in Audacity.
In the MPC player, drag any file and continuously play the entire directory.
After 1-2 minutes the sound from the DAC disappears. The I2S bus is silent. but you can still change the sample rates in the mixer.