I have sporadically horizontal offsets during the print. Sometimes after many hours. In the image below it is a 3mm X-shift after 13h print time. By chance, I could observe the behavior one time. There was a severe oszilation/wobble with a high frequency and a small amplitude over a duration of 1-2 seconds. Afterwards the print went on with a horizontal offset. Edit: I am no more shure about the oszilation, this could also have been a zig-zag movement during a small infill. I have no idea, what I could do. Scratch built Bigbox dual hybrid, Rumba board & DRV8825