I have had two sewing machines, a Juki and a Janome that kept sewing after I took my foot of the foot control. Both times I had to get a new foot controller. The new controller stopped the extra stitches. I would try a new controller before paying for expensive repairs if not under warranty. I bought both controllers on line after the shop gave me a quote of their prices. The ones I bought on line were one third the price of the shops. I wouldn't have minded paying more to the shop but not 2 times the price I paid for them online.