Try a new needle make sure the top thread has not come off the thread take up lever there could be something wrong with the cam that does the zig zag stitch, if the problem continues you may need to have the machine checked
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Try a new needle
make sure the top thread has not come off the thread take up lever
there could be something wrong with the cam that does the zig zag stitch, if the problem continues you may need to have the machine checked