I have a APQS Millennium machine, that I have stitched with for 8 years. I have had very few problems. Today has been a frustrating day! The top thread was fraying, so I diligently checked for burs and sanded as much as I could with emery cloth. All seemed good on my sample swatch. I switched back to my client's quilt, and all hell broke lose... again. Big, looping skipped stitches and broken thread. This was after about 10 minutes of stitching problem free. This quilt is about 30 years old, and is probably broadcloth with a lot of sizing in it. Could this be the problem - the sizing- the broadcloth, the age of this unwashed fabric?