@CrankyCoder - yes, I was aware of that. There seem to be some difficulties with the cam. I bought two of them because they had been used as cameras in either rhasspy or snowboy demo setup (forgot where it was). Ok, new test is running now with master+satellite together. This is the first time that I have a godd feeling about the test since there is a real potential root cause 
Keep you updated.
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Ok, it seems to run stable using arecord! 
@tuxedo78, thanks for the golden hint, that saved my weekend! 