lolek thanks, mainly keep an eye on the audio hickups and "broken pipe" log messages you initially reported - I think current nightly builds should be fine now though.
There seem to be occasional audio glitches with HD audio passthrough (which won't show up in logs), we are looking into it but so far I could not reproduce those here.
HDR output issues, like banding in the clouds, are also known - fixing those will take a while, kodi and video driver are currently missing several important bits and pieces.
Occasionally dropped or duplicates video frames is a different issue. We are aware of it, see also RPi 4B - Periodic repeated frames, CDVDClock::ErrorAdjust in log · Issue #19263 · xbmc/xbmc · GitHub
so long,
Hias