I had such a problem with my sewing machines pre-set 2.5 stitch length setting and the seams coming open. I was really frustrated and then I realized my stitch length was too long. I went down to 2.0 and have had a lot less problems. Even so, if I have a lot of seams on the outside of a quilt or a big block that I am having to move a lot, then I will run a staystitching line inside the 1/4" seam to not have to worry. I have heard of people backstitching when sewing all their seams. I rarely do that. Sometimes, when there is a grouping of bias cuts on the outside, I will staystitch those just to keep them from stretching.