I have read on this board about the Bernina 820/830 BSR skipping stiches when quilting. I too, had the same trouble. It was not catching with the bobbin thread every so often. My tech put a heavier spring in the BSR and I have only taken a few rows on the frame with it, but no skipping. Just thought I would share that with the group. I guess time will tell if that was the overall solution.