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DAC+ ADC pop / click sound

Hi,

I've searched the forum, but I didn't find exactly the same problem or any similar solution to this.

I am using RPi4 with DAC+ ADC running Hifiberry OS the latest build.

Independet of the source I noticed well audible pop / click sounds under the following circumstances:

iTunes - everytime I hit play or jump to another timestamp while playing I, here this sound:

 

Spotify - I think it's the same problem, but not as audible as with iTunes (maybe because iTunes has this significant delay before playing):

Analog Input - Here it's a different noise when start playing:

 

RPi start up

1) plugging in power supply (noise not really an issue)
2) red LED on DAC+ ADC lights up (noise not an issue)
3) but than comes this cleary audible sine wave

 

I here no issues, when I play continuously. I tried several audio files and input hardware.

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