Has anyone ever had trouble with this machine? I bought my wife this machine for Christmas and were have trouble with it already, it jams up and leaves a rats nest on the bottom side like the bobbin isn't quite right and we rethread everything and sews good for a while then messes up again. And I can't get it to sew for me to save my life. I've come to the conclusion that it don't like me a bit! Any info would be great. Thanks in advance!