I was working on my grandsons quilt and my thread keeps breaking. I have changed the needle, adjusted the tension (several times) changed the foot, re-threaded the machine, cleaned the machine, and it still keeps breaking! I am using Marathon cotton thread and it seems to shred (for lack of a better word) when the thread breaks. I even tried changing the thread. Has anyone had this problem or know how I can fix it? I have had to spend most of the day ripping out stitches because now it is skipping stitches. Thanks in advance for any help/advice anyone can give me!