Originally Posted by
cashs_mom
You didn't tell us if you were using the same thread as in the store? Same thread top and bobbin? Some machines don't like some threads and some don't like different threads top and bobbin.
Also ... whether they used your power cables and foot pedal at the store?
It's quite common that they use their own, for simplicity of hook up ......
Have you stitched on it at the store, yourself?
Two things ... maybe something different as to what you are doing to what the service tech does?
Or perhaps it takes a certain amount of time for it to act up?