I am just learning to use my new machine. It has a stitch regulator but I am getting all kinds of long stitches. A lot more than I get beeps while I'm sewing. I did change the thread but it is the same kind that I have been using, I think. Do you have any suggestions. I have double checked the threading. Could it be the tension? Or is it just me ? I've tried going slow and I've tried speeding up. What can I do??? Help!!!