my juki is on a quilting frame and usually pretty reliable..it sat all summer and this fall when I started quilting with it I was getting loopies on the botton. Had to re-adjust the bobbin. NOW WHY would that change over the summer...never had a problem before but now she is cooperating very well again. They are such nice machines..would love to take her to retreats but its such a pain unhooking etc and she is very heavy. Good LUck. BYW I only use 2 holes on the side and oil after every second quilt...sometimes I think too much is not good either