Popping short noise through headphone TK1

I have problems with a popping sound out of my headphone speakers when starting to play sound.
It is a short popping noise. It appears again short after the sound finishes to play.

Kind Regards

Is that with the downstream or mainline BSP? I recall there having been several PGA related fixes in the past.

BTW: BSP 2.8b1 is considered obsolete and no longer supported as noted in the following support strategy document.