i had a somewhat similar issue on mine (MKI) where BT changed into a noise machine: Analog Rytm OS 1.60A: bug reports - #44 by guga
it’s never been fixed for me i’m afraid, all the firmware upgrades have not done any good to it, it could be an hardware issue but it’s just a guess.
maybe yours is just firmware related (hopefully) else you should get in touch with HQ see what they’ve got to tell you

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