Day 2 of my new Janome 7700, and mostly very happy. Just one problem so far: I was sewing 2 units of a paper pieced block together, and the seam started with several layers to sew through. The machine wouldn't do it - fabric just wasn't moving forward. I had to move the block along a fraction, and after that it was fine, and other bulky sections went through without a problem. This has happened twice now. I was using the O2 foot. Can any 7700 owner help with this issue, please?