It has happened occasionally to me on my Sapphire too. I shut off, unplug for awhile and it resets itself. It does that when it overheats too. A note of caution for you. If you happen to put in a single hole needle plate, be sure to make a note to yourself to change it before switching to a decorative stitch! I had that error happen because the needle kept hitting the plate. It was a few minutes before I realized why. Only when I lifted up the fabric to try to cut the thread and noticed it. I felt so stupid! Now it is slightly off center.