I don't have a Brother, but occasionally I have had that happen. Is it happening when you 1st start sewing 2 pieces of material together at the edge of the fabric? If so, the it may help to hold the thread back behind the feed dogs & keep a little tension on them until you have locked in the 1st few stitches. I like to have my needle start about 1/16th to 1/8th inch in from the edge. Sometimes I have had that thread problem when going thru an especially thick intersection & I've found that walking it thru the intersection using the hand wheel on the side of my machine will help there. Not sure this info will help. Maybe someone else with a Brother will have another idea.