Actually, as bizarre as it sounds, I have a friend with 2 longarms who has done this and reports success. I would call her an expert, she quilts as many as 30 quilts a month, and she was having problems with one particular thread. She called the manufacturer who instructed her to put it in the freezer overnight. She rolled her eyes but figured she had nothing to lose, so she did, and it worked! She said it sewed like a dream the next day. I do not know which thread it was or why it worked.