machine does not sew. the top thread breaks. I checked and cleaned bobbin area. changed the needle, rethreaded the machine. when I turn on the machine and try to sew, it will start but then it makes a noise, vibrates, the top thread breaks in the bobbin area, and I get the message to stop for safety purposes. the bobbin holder does not seem to be staying in place. I even tried a new bobbin.
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