I have a Janome 1600P machine now 1-1/2 yrs. old on a Gracie quilt frame that I ordered online as a package because no one locally carried it. I had a lot of trouble with top thread breaking, but now I finally found a thread it likes (Guterman). It will sew all right with the straight stitch, but when I put on the free motion foot with the thick plate to cover feed dogs, it fails to pick up the bobbin thread. It just keeps sewing and makes no stitches. Janome will not help me--says take it to a dealer at my own expense since I bought it online. First, does anyone have any advice that I can try myself--anyone ever had this trouble? Appreciate anything you can offer.