It just happened to me again, just a random change of a kick into a dull nothing. The change can happen while the pattern is playing or when you change to tweak another track, there doesn’t seem to be a totally reproduceable pattern. But reloading the patch is always OK, fixes the sound. so something ‘goes’ after a while. Could still be user error but I don’t recall this being an issue before the last upgrade, at least for me. I was just using A142 kick, unmodified in this one, if it helps anyone to know.