Boy oh boy...do I need help and advice. In August I purchased a Janome 3160 QDC. It is a wonderful machine with such features as needle threader and cutting thread feature which really sold me on the machine. I have had so much trouble with the bobbin casing and was wondering if anyone else has had trouble. I have had it changed once and now it is acting up again. It seems the bobbin giggles all around and is quite noisy...I just stopped right in my tracks and will again have to take it in again to be looked at. Wondering...with all those features...did I not spend enough money and am looking for it to perform like a very expensive machine...anybody having problems??