If it's clear nylon monofilament thread, here are my tips.
If the thread is on a cone, use a threadnet so thread feeds from the top; without a thread net, the thread can puddle and get caught under the cone.
Lower the upper tension considerably; this is because nylon monofilament stretches.
When you wind the bobbin, wind slowly to avoid stretching the thread during the process. Metal bobbins are preferable to plastic bobbins because the plastic bobbins distort more easily from stretched thread. In any case, do not fill the bobbin more than 3/4ths full to avoid distorting the edge of the bobbin.