My Avante is about 9 years old. Works great. Recently finished customer quilts with no problem. New customer wants So Fine 40 varigated thread which I do not use. Superior Thread suggested 18 needle so I changed to that. Using the varigated in top and bobbin. Tested and seemed like I needed to increase tension which I did, retested and fine. Started the first panto row. After about 15 inches, top thread broke. Rethreaded and tried again. About 12 inches, broke again. The fibers around the core of the thread are bunching together so that I have a bunch several inches from the thread break. I backed off of the tension. Still breaking. Many times. Called the thread company but had no other ideas. Would you have any thoughts??
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