Originally Posted by
Dreaming
I'm useing YLI and it is nylon. Unfortunately, I did wind it till it was full and I did wind it fast.
YLI nylon is what I use for a monofilament thread. My Bernina handles it well in both top and bobbin, but I do all those things I mentioned in the previous post. I also use a thread net over the cone. Try winding a new bobbin and reducing the upper tension to half what is normal (mine runs well at a 2 or 3 setting).