Originally Posted by
Ben
Thanks for all the help from the board we took the machine in to the shop last night and just as stated it wouldn't act up for them but they suggested Alot of the same as you did by using leaders and making sure that the machine was keep clean which by the way it was full of lint already under the bobbin holder. I couldn't believe how much was there for it only being a month old! They also gave us a spool of some other thread to try and I bought 20 of the janome bobbins for safe measure.
Ah ha!! The Janome 6600 does not like lint under its bobbin case! If it's been sewn on for a month without cleaning it out that's probably what all of your problems were. Clean under that bobbin case frequently!!!