Ask the dealer to return it to the Mgf. I have a babylock quest that had the same problem....still being repaired after months. Check your bobbin to see if there is an extra little "washer" like thing at the back (inside) which seems unattached - but don't remove it. If it becomes detached you get all kinds of problems. I have also had the needle stop and just move up and down in one place as long as I keep the machine turned on. Don't know why it does it, but it happens.