Here's what we have learned:
I can tell you for certain that the FireLine factory has issues with two batches of Crystal FireLine. It was insufficient fusing, which causes the thread to fray and break easily. If you look at your FireLine label you will see the description. The last line has a code with dashes. EG. L-18-12-2. We are looking for Batches that start with “C” or “D”.
If you have one of these, please contact customer support at firstname.lastname@example.org