I believe Janome in general have more problems with birds nests on the back as several of my friends and I have had problems with that too. I got Magic Genie at the suggestion of one of those friends. It is a little ?silicone disc that fits in the bobbin area and seems to calm down the thread. It works for me with my Horizon and a friend who has the big fancy top of the line Janome. I do notice that Coats and Clark and Metrosene work best in my machine. I ordered my Magic Genie from Clotilde, now Annies.