My sympathies are with you for your troubles. I have a Viking Mega Quilter (made by Tin Lizzie). It has had every electronic piece in it replaced, overhauled stem to stern, and the last time it came back it had the same problem as when it went to the factory. It has spent more time at the factory than in my use. I would suggest that you are having trouble with the electronic board in it. My machine worked for the first half hour of use, and then would go all crazy on me, stitches skipped, sped up, the only way you could stop this was to unplug it for a half hour or more. I ended up replacing the machine with a HQ Avante. Best and smartest purchase I ever made. My plan for the mega quilter is to let my son have it for an anchor when he goes fishing.