I have a Janome 6600 and have not experienced any bobbin problems. Perhaps you might try putting the tied end on the BOTTOM when putting the bobbin in. This way it will not get caught in anything. I don't know but it may be worth a try. Hope it helps. The only trouble I ever had was in winding the bobbin. Sometimes it just goes nuts and I get a very loose winding. Do not know what I did wrong bt I try again and it is fine.