Last evening after spending most of the day doing one and the same project my machine decided to play up. It kept gathering the thread under my work which I had almost finished. I took the piece from the machine and rethreaded the bobbin and the same happened. Then I took the bobbin case out and cleaned everything even took the metal plate off as there was some stray thread under it. Still the same thing happened. I did this 3 times without success. I knew at this point that I had already wasted the piece I was doing which was a base for a bowl. Pulled the embroidery arm off and put my ordinary machine arm on. Then I proceeded to stitch a basic stitch to see if it would sew. PERFECT. Then I put the embroidery arm back and everything was good, but with the problems I had before this exercise my design had now moved and even though I tried it would not stitch in the same place, but the machine is working fine again. Just wasted the time and thread on that base. Have to tackle another today.