Is it just at the start of seams? Something that could be remedied with a straight stitch throat plate and/or scrapping on? Or maybe a tension issue? You may have already tried all this, but maybe look for a little speck of lint or thread somewhere, open the top tension to zero and "floss" the discs gently with UNwaxed floss or thread, clean out the bobbin case really well. Surely others who are more mechanically inclined have better/more ideas. After that, haunt your dealer until you get what you paid for! You deserve a machine that works as advertised, an effective tool to manifest your creativity.