I realised that everytime I process a sample in the sample editor, the sidechain stops working. I have to move the threshold slightly to make it "catch" the source again. Also the attack settings get changed, I have to move this one as well to get my settings back. In this video I show the issue. The sidechain source is my K1 track (big kick) https://youtu.be/pgz2gihfTe0